Low Carb Pizza Casserole Bake

Featured in: Hearty and Delicious Mains

This easy low carb pizza casserole delivers classic pizza flavors in a healthier baked dish. Tender cauliflower replaces the crust, absorbing savory pasta sauce and mingling with spicy Italian sausage, sautéed mushrooms, green peppers, and plenty of melty mozzarella. Pepperoni adds that iconic pizzeria touch, while a sprinkle of Parmesan and Italian seasoning amps up the flavor. Layered and baked until bubbly, it’s a satisfying main course that’s both comforting and suitable for low carb lifestyles.

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Updated on Thu, 03 Jul 2025 13:24:40 GMT
A pan of food with pepperoni and mushrooms. Pin it
A pan of food with pepperoni and mushrooms. | tastygusto.com

When you are craving hot cheesy pizza flavors but want something comforting and lower in carbs this low carb pizza casserole hits the spot. Packed with Italian sausage, mushrooms, green pepper and pepperoni nestled among tender cauliflower and gooey mozzarella, it feels totally indulgent while still fitting a lighter lifestyle.

My crew always lights up for pizza night and this hearty casserole quickly took center stage. I first made it as a clean-out-the-fridge meal and now it is a monthly favorite for busy weeknights.

Ingredients

  • Cauliflower florets: Cut into bite-size pieces Brings bulk and nutrition while soaking up all the pizza flavors Choose firm tight florets with no dark spots
  • Pepperoni: Adds meaty spicy bites Go for natural brands with minimal additives
  • Italian Sausage: Choose a spicy or mild version in bulk or in casings Remove from casing for quicker cooking Seek out sausage with good marbling for flavor
  • Olive Oil: Helps sauté the mushrooms and brings extra richness Go for extra virgin if possible
  • Mushrooms: Sliced for earthy depth of flavor Cremini or white button mushrooms work well Look for smooth firm caps
  • Green Pepper: Adds freshness and crunch Choose one that feels heavy with vibrant skin
  • Mozzarella cheese: Shredded creates the gooey pizza stretch Opt for whole milk mozzarella for melt and flavor
  • Low Carb Pasta Sauce: I like Rao’s for its balanced taste and low sugar but any lower carb marinara works Check the label for no added sugars
  • Parmesan cheese: Powdered adds savory sharpness Freshly grated for best impact
  • Italian Seasoning: Brings classic pizza herb flavors Use a good dried blend or homemade if you like

Step-by-Step Instructions

Steam the Cauliflower:
Place the bite-size cauliflower florets in a microwave safe bowl with a cup of water Cover with a damp paper towel and microwave on high for about three minutes or until the cauliflower is just tender Test with a fork so that it is firm but cooked through Drain well then pat the florets fully dry with a paper towel to avoid watery casserole Set aside
Brown the Sausage:
Preheat your oven to four hundred degrees Fahrenheit In a large skillet over medium high heat add the Italian sausage Cook it for about fifteen minutes stirring to break up large pieces Once beautifully browned and cooked through drain off excess fat so your casserole stays rich without being greasy Set aside
Sauté the Mushrooms:
In the same skillet pour in the olive oil over medium high heat Add the sliced mushrooms and let them sauté for ten minutes until they have released their water and are turning golden Stir occasionally and do not overcrowd so they caramelize properly Remove and set aside
Prep the Casserole Dish:
Spray a thirteen by nine inch casserole dish with non-stick spray Spread half a cup of pasta sauce evenly across the bottom so your flavors start with every bite
Mix and Layer Ingredients:
In a large mixing bowl toss together the steamed cauliflower cooked sausage sautéed mushrooms and chopped green pepper Mix so everything is well distributed throughout the casserole For the first layer spread half this mixture in your dish Top with half a cup of pasta sauce layer on half the pepperoni slices pressing them gently between the toppings and sprinkle with half the mozzarella cheese
Repeat the Layering:
Place the remaining veggie and meat mixture on top followed by the last of the pepperoni keeping ten slices aside for the top Drizzle with remaining pasta sauce and finish off with the rest of the mozzarella
Add Cheesy Topping:
In a small bowl stir together the powdered Parmesan and Italian seasoning Sprinkle this cheesy mix evenly over your casserole artfully arrange those ten pepperoni slices on top to finish
Bake Until Bubbling:
Place your casserole uncoverered in the oven on a center rack Bake for thirty minutes or until hot throughout and the cheese is bubbling and melted Let rest for a few minutes before serving for easiest slicing
A pan of food with pepperoni, mushrooms, and cheese. Pin it
A pan of food with pepperoni, mushrooms, and cheese. | tastygusto.com

One thing I look forward to is the delicious browned cheesy edge you get from the mozzarella on top That golden crust always draws family to sneak bites while this rests out of the oven It is a small battle of forks every time

Storage Tips

Leftovers keep well in the fridge for up to four days Cool completely before storing then cover tightly or spoon into airtight containers For longer storage this casserole freezes well for up to two months Wrap portions tightly in plastic wrap then bag for easiest reheating Thaw overnight before microwaving or warming gently in the oven

Ingredient Substitutions

You can switch up the meat easily If you do not have Italian sausage try ground beef turkey or even a plant-based sausage Skip the pepperoni for a lighter casserole or use turkey pepperoni for less fat No green pepper available Try red or yellow peppers or add some sliced black olives for a different flavor

Serving Suggestions

This pizza casserole is a full meal on its own but it shines with a simple side salad finished with olives or a tangy vinaigrette Add roasted broccoli or sautéed spinach for a big plate of color If you want more texture toss in a handful of chopped artichoke hearts or sun-dried tomatoes before baking

A pan of mushrooms and pepperoni. Pin it
A pan of mushrooms and pepperoni. | tastygusto.com

Once you try this casserole you will find it is a reliable go to for both family gatherings and solo meal prep nights The edge pieces disappear fastest in our house and nobody ever misses the crust

Frequently Asked Questions

→ How do I prevent the casserole from becoming watery?

Make sure to steam the cauliflower only until tender and pat dry thoroughly before assembling. Also, sauté mushrooms well to release excess moisture.

→ Can I substitute the Italian sausage?

Yes, use ground turkey, beef, or a vegetarian sausage alternative to suit your preference while maintaining the dish’s flavor profile.

→ What type of pasta sauce works best?

Choose a low carb, sugar-free marinara for the richest flavor, such as Rao’s Homemade Marinara, or use any favorite marinara with minimal added sugars.

→ How can I make this dish spicier?

Spice things up by using hot Italian sausage or adding a pinch of crushed red pepper flakes to your meat mixture before baking.

→ Is this casserole freezer friendly?

Yes. Cool completely, wrap tightly, and freeze. Reheat in the oven until warmed through for best texture and flavor.

→ Can I add more vegetables?

Absolutely. Try adding spinach, black olives, or onions for extra taste and nutrition without affecting the low carb content significantly.

Low Carb Pizza Casserole

Cauliflower, sausage, and pepperoni blend with cheese in a savory, low carb bake, perfect for satisfying comfort food cravings.

Prep Time
25 Minutes
Cook Time
30 Minutes
Total Time
55 Minutes

Category: Main Dishes

Difficulty: Intermediate

Cuisine: Italian-American

Yield: 8 Servings

Dietary: Low-Carb, Gluten-Free

Ingredients

→ Vegetables

01 400 grams cauliflower florets, cut into bite-size pieces
02 1 green bell pepper, cut into bite-size pieces
03 225 grams mushrooms, sliced

→ Meat and Sausage

04 900 grams Italian sausage, casings removed if necessary
05 70 grams pepperoni slices

→ Dairy

06 340 grams mozzarella cheese, shredded
07 25 grams Parmesan cheese, powdered

→ Sauces and Seasonings

08 360 millilitres low-carb marinara sauce
09 1 tablespoon olive oil
10 1 teaspoon Italian seasoning

Instructions

Step 01

Place cauliflower florets into a microwave-safe bowl with 240 millilitres of water. Cover with a damp paper towel and microwave on high for approximately 3 minutes or until just tender. Avoid overcooking.

Step 02

Drain the cauliflower thoroughly and gently pat dry with paper towels. Set aside.

Step 03

Preheat oven to 200°C.

Step 04

In a large skillet over medium-high heat, cook Italian sausage for about 15 minutes, crumbling as it cooks. Drain excess fat. Set aside.

Step 05

Using the same skillet, add olive oil and sauté sliced mushrooms over medium-high heat for 10 minutes to remove excess moisture. Set aside.


A pan of mushrooms and pepperoni.
Step 06

Lightly grease a 33 x 23 centimetre casserole dish with non-stick spray. Spread 120 millilitres of marinara sauce evenly over the bottom.

Step 07

In a large bowl, combine cooked cauliflower, browned sausage, sautéed mushrooms, and green pepper. Mix until evenly distributed.

Step 08

Spread half of the filling mixture into the prepared dish. Top with 120 millilitres marinara sauce, followed by half the pepperoni and 170 grams mozzarella, pressing pepperoni slightly into the layer.

Step 09

Add the remaining filling mixture to the dish. Top with most of the remaining pepperoni, reserving 10 slices for garnish, the remaining 120 millilitres sauce, and 170 grams mozzarella cheese.

Step 10

In a small bowl, combine Parmesan cheese and Italian seasoning. Sprinkle the mixture evenly over the casserole and arrange the remaining pepperoni slices on top.

Step 11

Place casserole in the preheated oven and bake for 30 minutes or until thoroughly heated and cheese has melted and begun to brown.


A pan of food with pepperoni, mushrooms, and cheese.

Notes

  1. Ensure cauliflower is just tender after steaming to prevent a watery casserole.
  2. Drain excess fat from sausage well to improve texture and reduce greasiness.

Tools You'll Need

  • Large skillet
  • Microwave-safe mixing bowl
  • 33 x 23 centimetre casserole dish
  • Oven

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Contains dairy from mozzarella and Parmesan cheese.

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 432
  • Total Fat: 32.5 g
  • Total Carbohydrate: 7.5 g
  • Protein: 29.2 g