1-First Step: Preheat and prep the pan. Set your oven to 350°F (175°C). Grease a 9×13-inch (23×33 cm) baking dish well. This prevents sticking and ensures even baking for your biscuit casserole.

2-Second Step: Cut the biscuits. Open both cans of refrigerated buttermilk biscuits. Cut each biscuit into quarters or small bite-size pieces. Smaller cuts help the center cook through evenly, avoiding doughy spots.

3-Third Step: Layer the base. Spread the biscuit pieces in a single layer across the prepared dish. Stack slightly near the edges so they bake evenly. For a saucier version, use just one can of biscuits.

4-Fourth Step: Add sauce. Spoon the 15 oz (425 g) pizza sauce evenly over the biscuit dough. Spread it out for full coverage, tying into that classic pizza casserole vibe. For dietary tweaks, use low-sugar marinara here.

5-Fifth Step: Top with cheese and extras. Sprinkle 2 cups (approx 226 g) shredded mozzarella over the sauce. Layer on pizza toppings like pepperoni, cooked Italian sausage, mushrooms, olives, bell peppers, onions, or spinach. For delicate greens like spinach, tuck them under the cheese or mix into the sauce to prevent burning. Boost flavor with Italian seasoning, grated Parmesan, or red pepper flakes.

6-Sixth Step: Bake to perfection. Pop the dish uncovered into the oven for 25 to 30 minutes. Watch until the dough cooks through and cheese browns lightly, checking the center which takes longest. If the top browns too fast, tent with foil. A toothpick in the center should come out clean.

7-Final Step: Rest and serve. Let the casserole rest at least 5 minutes before slicing. This sets the cheese and makes serving easier. Enjoy your one-pan bubble up biscuit pizza casserole hot!