Prepare the barbecue glaze by combining the barbecue sauce, Dijon mustard, and brown sugar until mixed thoroughly. Set aside.
Preheat the oven to 400 degrees. Line a baking sheet with foil, then place a wire cooling rack in it.
Prepare the meatloaf mixture by whisking the milk and egg in a small bowl; add the crushed croutons and set aside.
Mince the onion, garlic, carrot, celery, and parsley together in a food processor.
Combine the crouton mixture, onion mixture, and ground beef with the barbecue sauce, Dijon mustard, Worcestershire sauce, sea salt, and freshly cracked pepper to taste; mix gently with just your fingertips together in a large bowl.
Form the mixture into two smaller loaves.
Put the mini loaves on the prepared rack a few inches apart.
Bake the meatloaves by placing the baking sheet in the oven for 15 minutes.
Brush the glaze on the loaves after cooking for 15 minutes, then continue baking for an additional 20 minutes or until a meat thermometer reads 160 degrees.
Let the two loaves rest for 10 minutes before slicing and serving. Enjoy!!