Easy Tuna Pasta Bake

Ingredients (10)

• + 1 (14.6 ounce) package penne pasta add to pantry
• + 1 tablespoon olive oil add to pantry
• + 1 tablespoon butter add to pantry
• + 1 onion, chopped add to pantry
• ✓ 3 (5 ounce) cans tuna, drained and flaked
• + 1 cup heavy whipping cream add to pantry
• ✓ salt and ground black pepper to taste
• + salt and ground black pepper to taste add to pantry
• + ½ teaspoon ground nutmeg add to pantry
• + 1 ¼ cups grated Parmesan cheese add to pantry