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
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