Stuffed Red Peppers

Ingredients

• 1 cup brown rice
• 4 cups water
• 1 pound ground beef
• 1 onion, diced
• 1/4 cup chopped mushrooms, or to taste
• 3 cloves garlic, chopped
• 1 (16 ounce) can diced tomatoes
• 1 (6 ounce) can tomato paste
• 1 teaspoon Italian seasoning
• salt and ground black pepper to taste
• 6 red bell peppers, tops and seeds removed
• 1/4 cup grated Parmesan cheese, or to taste