Step 1: Preheat your oven to 375 °F (190 °C).
Step 2: In a large skillet over medium heat, cook the ground beef and finely chopped onion until the beef is no longer pink, about 7 minutes. Drain any excess fat thoroughly.
Step 3: Stir in the minced garlic and Italian seasoning. Sauté for 1 minute until fragrant.
Step 4: Add the marinara sauce to the skillet and bring it to a gentle simmer for 2–3 minutes, then remove it from the heat.
Step 5: In a 9x13-inch baking dish, arrange half of the quartered biscuit pieces. Spoon half of the meat sauce over the biscuits. Dollop spoonfuls of ricotta cheese evenly, then sprinkle with 1 cup of mozzarella cheese and half of the Parmesan cheese.
Step 6: Repeat the layers with the remaining biscuits, meat sauce, ricotta, mozzarella, and Parmesan cheese.
Step 7: Cover the baking dish loosely with aluminum foil and bake for 20 minutes. Remove the foil and continue baking for another 5–7 minutes, or until the biscuits are golden brown and the cheese is bubbly and melted.
Step 8: Let the casserole rest for 5 minutes before serving to allow the sauces to set and prevent burns.