Ingredients

• 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

Instructions

1. Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper and place a cooling rack on top. Mist the rack lightly with cooking spray.
2. 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.
3. 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.
4. Meanwhile, spread mayonnaise on one side of each bun. Serve each meatloaf slider on a prepared bun.
5. Photograph by Mark Peterson