Brad's Slow Cooker Chicken Parmesan

Ingredients (11)

• + 1 cup all-purpose flour add to pantry
• ✓ 3 eggs
• + 12 ounces Italian-seasoned bread crumbs add to pantry
• ✓ 6 skinless, boneless chicken breasts
• ✓ 6 tablespoons butter, divided, or more to taste
• + 2 (24 ounce) jars marinara sauce, or more to taste add to pantry
• + 12 slices mozzarella cheese add to pantry
• + 1 (3 ounce) package Parmesan cheese add to pantry
• + 2 tablespoons oregano add to pantry
• + 2 tablespoons basil add to pantry
• + 1 tablespoon garlic powder add to pantry