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Steam the cauliflower. Place cut cauliflower in a microwave safe bowl with 1 cup of water. Cover with a damp paper towel and microwave on high for approximately 3 minutes or until the cauliflower is tender. Don’t overcook!
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Drain the cauliflower pat dry with a paper towel. Set aside.
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Preheat oven to 400 degrees F.
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In a large skillet over medium high heat cook the Italian sausage, approximately 15 minutes. When the sausage has finished cooking drain the excess fat. Set aside.
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In the same skillet at olive oil and saute mushrooms over medium high heat for 10 minutes to remove the excess water. Set aside when done.
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Prepare a 13×9 inch casserole dish by spraying it with non-stick spray then spread ½ cup of pasta sauce on the bottom.
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In a large bowl add the cauliflower, cooked Italian sausage, mushrooms, and green peppers. Toss together until well mixed.
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Spread ½ of the mixture in the casserole dish. Top with ½ cup of pasta sauce, followed by ½ of the pepperonis (kind of press them down in between the other toppings), and finally 6 ounces of mozzarella cheese.
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Next spread the remaining toppings mixture over the cheese followed by the pepperonis (save 10 slices for the top of the casserole), remaining ½ cup of pasta sauce, and 6 ounces of mozzarella cheese.
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In a small bowl mix together the Parmesan cheese and Italian seasoning.
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Sprinkle the Parmesan mixture over the casserole and top with 10 slices of pepperoni.
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Place in oven and bake for 30 minutes, or until the casserole is warmed through and the cheese is fully melted.