Chicken Parmesan Burgers

Ingredients (15)

• + 4 small skinless, boneless chicken breasts, cubed add to pantry
• + 1 teaspoon dried parsley add to pantry
• + 1 teaspoon dried oregano add to pantry
• ✓ 1 teaspoon dried basil
• + ½ teaspoon salt add to pantry
• + ¼ teaspoon ground black pepper add to pantry
• + 1 cup bread crumbs add to pantry
• + 1 cup grated Parmesan cheese add to pantry
• ✓ ¼ cup butter, divided
• + 4 slices bread add to pantry
• + ⅓ cup chopped onion add to pantry
• + 1 clove garlic, minced add to pantry
• ✓ 4 mushrooms, thinly sliced
• + 2 tablespoons all-purpose flour add to pantry
• + 1 (8 ounce) can spaghetti sauce add to pantry