Zucchini pizza casserole turns fresh shredded zucchini into a cheesy crust topped with sausage, peppers, sauce, and melted cheese. It's a garden-inspired dinner that feels part pizza, part casserole, and completely right on a weeknight.
Preheat the oven to 375°F. Grease a quarter-size sheet pan, and set aside.
Prepare the zucchini: Place the shredded zucchini in a strainer and add ½ tsp salt. Mix until combined and let sit to draw out moisture for 15 minutes.
4 cups shredded zucchini, 1 ½ tsp kosher salt
While the zucchini sits, prepare the sauce: Heat a 12-inch skillet over medium heat and add the neutral oil. Add the ground sausage and cook. Break up the sausage into small pieces and cook until completely browned, 8-12 minutes. Once the sausage is cooked, remove it from the skillet, leaving any liquid in the pan. To the skillet, add the bell pepper and onion and cook for 4-6 minutes or until tender. Then, add the red pepper flakes, oregano, basil, and ½ tsp salt. Stir, then add the tomato sauce and cooked sausage. Bring the tomato sauce and meat to a simmer. Cook until the sauce is slightly thickened, 4-6 minutes. Once cooked, remove from the heat.
1 ½ tsp kosher salt, 1 tbsp neutral oil, 1 lb bulk sausage, 1 medium red bell pepper, 1 small onion, ¼ tsp red pepper flakes, 1 tsp dried oregano, 1 tsp dried basil, 14 oz tomato sauce
Strain the zucchini: Place the strainer over a bowl and squeeze out as much moisture as possible. Place the zucchini in a large bowl once strained.
Prepare the crust: To the zucchini, add the whisked eggs, 1 cup mozzarella cheese, ¼ cup Parmesan cheese, the remaining ½ tsp salt, black pepper, and garlic powder. Stir together until incorporated and pour into the sheet pan (or a 9 x 13-inch baking dish). Spread the mixture out evenly and push up the sides of the dish approximately 1 inch, creating a crust edge.
1 ½ tsp kosher salt, 3 large eggs, 2 ½ cups shredded mozzarella cheese, ½ cup grated Parmesan cheese, ½ tsp freshly ground black pepper, ¾ tsp garlic powder
Bake the crust: Place the crust in the preheated 375°F oven and bake until the crust is set in the middle, and the edges begin to brown, 12-15 minutes. Once baked, remove the crust from the oven and increase the oven temperature to 425°F.
Assemble: Pour the prepared meat sauce mixture on the crust and spread evenly. Top with the remaining 1 ½ cups mozzarella cheese and the remaining ¼ cup Parmesan cheese.
2 ½ cups shredded mozzarella cheese, ½ cup grated Parmesan cheese
Finish baking: Return to the preheated 425°F oven and bake until the cheese is melted and beginning to brown, 15-18 minutes.