Step 1: Preheat your oven to 400°F (200°C). Have four individual oven-safe bowls or ramekins ready.
Step 2: In a large skillet over medium-high heat, cook the ground Italian sausage (or ground beef) until browned and cooked through. If using, add chopped onion and bell pepper during the last 5 minutes of cooking until softened. Drain off any excess fat.
Step 3: Divide the cooked meat and vegetable mixture evenly among the four oven-safe bowls.
Step 4: Spoon 1/4 cup of low-sugar pizza sauce over the mixture in each bowl, spreading it gently to cover.
Step 5: Top each bowl generously with 1/2 cup of shredded mozzarella cheese.
Step 6: Arrange sliced pepperoni, black olives, and mushrooms (or your preferred toppings) over the cheese in each bowl.
Step 7: Bake for 10-15 minutes, or until the cheese is melted, bubbly, and lightly golden brown. For extra browning, you can broil for the last 1-2 minutes, watching carefully.
Step 8: Carefully remove the bowls from the oven. Let them cool for a couple of minutes before serving, as they will be very hot. Garnish with fresh basil or red pepper flakes if desired, and enjoy your Ultimate Low Carb Crustless Pizza Bowl Keto Dinner!