Cracker Barrel Meatloaf

Name: Cracker Barrel Meatloaf
Prep time: 10 min
Total time: 10 min
Cuisine: American
Ingredients: Cooking spray; 1 tbsp. unsalted butter; 1 small yellow onion, finely chopped (about 1/2 c.); 1/2 medium green bell pepper, seeds and ribs removed, finely chopped (about 1/2 c.); 1 plum tomato, finely chopped (about 1/2 c.); Kosher salt; Freshly ground black pepper; 2 tbsp. tomato paste; 2 tbsp. Worcestershire sauce; 1 tsp. garlic powder; 3 tbsp. yellow mustard, divided; 3 large eggs; 24 Ritz crackers, crushed (about 1 c. crumbs); 1 c. shredded cheddar; 1/4 c. chopped fresh parsley, plus more for serving; 2 lb. (80%) lean ground beef; 1/3 c. ketchup; 1 tbsp. dark brown sugar