Meatloaf in a muffin pan

Ingredients
1 2/3 to 1 3/4 pounds ground sirloin
1 medium onion, cut into chunks
2 ribs celery from the heart of the stalk, cut into 2-inch pieces
1 green bell pepper
1 large egg plus a splash of milk, beaten
1 cup plain bread crumbs
2 tablespoons grill seasoning
1 cup smoky barbecue sauce
1/2 cup tomato salsa
1 tablespoon Worcestershire sauce
Vegetable oil or extra-virgin olive oil