Savory Italian Garlic Bread with Beef Filling

Ingredients

• 1 pound ground beef
• 1 medium onion, diced (about 150 grams)
• 3 cloves garlic, minced
• 1 cup marinara sauce (240 ml)
• 2 tablespoons tomato paste (33 grams)
• 1 teaspoon dried oregano
• 1 teaspoon dried basil
• 1/4 teaspoon red pepper flakes
• 1/4 teaspoon ground black pepper
• 1/2 teaspoon salt
• 1/4 teaspoon garlic powder
• 1 tablespoon olive oil
• 4 tablespoons unsalted butter, softened (about 56 grams)
• 4 sandwich rolls
• 2 tablespoons fresh parsley, chopped
• 2 tablespoons grated Parmesan cheese