Grilled Cheese and Bacon Mini Meat Loaves

1	lb extra-lean (at least 90%) ground beef
1/4	cup bread crumbs
3	tablespoons ketchup
1	teaspoon onion salt
1/2	teaspoon pepper
1	egg
1/2	cup shredded Cheddar cheese (2 oz)
4	slices center-cut bacon (about 3 1/2 oz), cut crosswise in half 1. Heat gas or charcoal grill for indirect cooking. 2. Meanwhile, in large bowl, mix all ingredients except bacon. On work surface, pat mixture into 7-inch square. Cut into 4 (3 1/2-inch) squares. Top each square with 2 half-slices bacon; attach with toothpicks. 3. Carefully spray grill rack with cooking spray. Place patties on unheated side of two-burner gas grill or over drip pan on charcoal grill (medium heat). (If using one-burner gas grill, cook over low heat.) Cover grill; cook 20 to 25 minutes or until slightly pink in center. 4. Using spatula, turn patties over. Cover grill; cook 5 to 8 minutes longer or until meat thermometer inserted in center of patties reads 160°F and bacon is crisp. Remove toothpicks before serving.