The kiddos will devour these cheese-filled burgers with the condiments of their choice, while the adults can dress them with an added kick of jalapeno mayonnaise and guacamole. From Southern Living Busy Moms Weeknight Favorites.
Process first 5 ingredients in a food processor or blender until smooth; chill.
Preheat grill to medium-high (350° to 400°). Combine ground chuck, onion, and salt; shape into 12 (4-inch) patties. Fold cheese slices into quarters; top 6 patties with folded cheese slice. Cover cheese with remaining 6 patties; pressing to seal edges.
Grill patties, covered with grill lid, over medium-high heat 5 minutes on each side or until done. For grown-up servings, serve burgers on buns with 2 tablespoons guacamole, 1 tablespoon mayonnaise mixture, and desired toppings. For plain servings, serve burgers on buns without the guacamole and mayonnaise mixture.