Cook the Meat:
Heat olive oil in a skillet over medium heat. Add the ground beef or sausage and cook until browned, breaking it into crumbles. Drain any excess grease.

Season the Meat:
Stir in garlic powder, onion powder, Italian seasoning, crushed red pepper flakes (optional), salt, and pepper. Mix well and cook for another minute.

Assemble the Pizza Bowls:
Preheat the oven to 375°F (190°C). In oven-safe bowls or ramekins, layer the cooked meat at the bottom. Pour the marinara sauce evenly over the meat.

Add Toppings:
Sprinkle shredded mozzarella cheese over the top, then add mushrooms, olives, bell peppers, and pepperoni slices. Top with grated Parmesan cheese.

Bake:
Place the bowls in the oven and bake for 10-12 minutes, or until the cheese is melted and bubbly.

Garnish and Serve:
Remove from the oven and garnish with fresh basil or parsley. Serve hot and enjoy your low-carb pizza bowl!