Stuffed Red Peppers with Quinoa, Mushrooms, and Turkey

Ingredients (12)

• + 2 cups water add to pantry
• + 1 cup uncooked quinoa add to pantry
• ✓ 1 tablespoon olive oil
• + 1 onion, diced add to pantry
• + 1 pound ground turkey add to pantry
• + salt and ground black pepper to taste add to pantry
• + salt and ground black pepper to taste add to pantry
• ✓ 12 mushrooms, chopped, or more to taste
• + 1 (24 ounce) jar tomato sauce, or more to taste add to pantry
• + 1 (6 ounce) can tomato paste add to pantry
• ✓ 8 large red bell peppers - tops, seeds, and membranes removed
• + 1 (8 ounce) package shredded Cheddar cheese, or to taste add to pantry