- Cooking spray
- 1 pound extra-lean ground beef
- 1 large egg, lightly beaten
- 1/2 cup ketchup
- 1/4 cup grated onion
- 1/4 cup breadcrumbs
- 1/2 tablespoon Worcestershire sauce
- 1 tablespoon minced fresh parsley
- 1 teaspoon minced fresh thyme
- Kosher salt and freshly ground pepper
- 1/4 teaspoon garlic powder
- Mayonnaise, for serving
- 24 slider-size hamburger buns, split
Combine the beef, egg, 1/4 cup ketchup, the onion, breadcrumbs, Worcestershire sauce, parsley, thyme, 1/2 teaspoon each salt and pepper, and the garlic powder in a large bowl. Use your hands to mix everything together.
Shape tablespoonfuls of the meat into small, thin patties, about 2 inches in diameter. Place on the prepared rack on the baking sheet. Brush the patties with the remaining 1/4 cup ketchup and bake about 20 minutes.
Meanwhile, spread mayonnaise on one side of each bun. Serve each meatloaf slider on a prepared bun.
Photograph by Mark Peterson