Add ground beef, diced onion and minced garlic to a large skillet over medium-high heat. Break up beef with a spatula and stir often until no longer pink; 5-7 minutes. Drain grease or soak up with paper towels and discard.
To the cooked beef mixture, stir in tomato paste, beef broth or water, and all taco seasoning. Bring to a boil, then reduce heat to medium-low and cook, stirring often, until sauce is thickened and reduced; about 10-15 minutes. Set aside.
Sliders
While the meat is cooking, preheat oven to 375℉. Lightly spray a 9”x13” baking dish with nonstick spray.
Slice the slider buns in half horizontally, and place the bottom buns in the prepared 9”x13” pan. Bake for 5 minutes, or until the buns start to get lightly browned and crunchy. This step is important to keep the bottom buns from getting soggy.
Layer half of the shredded cheese onto the buns, then the taco meat (use a slotted spoon and let sauce drip off), then the remaining shredded cheese. Place the top buns on.
In a small bowl, mix together melted butter, garlic powder, onion powder and salt. Brush onto the tops of the buns.
Cover the pan with foil and bake for 10 minutes. Be careful not to let the foil touch the tops of the sliders; use toothpicks if necessary.
Remove foil and bake for 5-7 more minutes, or until the tops are golden brown and the cheese is melted.
Top with chopped cilantro, slice sandwiches apart at the seams and serve immediately with toppings of your choice.
Notes
These sliders are best when eaten soon after being made. They can become soggier after being stored, especially if they have any extra toppings on them.
Store tightly covered in the refrigerator for up to 3 days, with toppings stored separately.
To reheat: Place in a baking dish and cover with foil. Bake at 350℉ for 15 minutes, or until warmed through. You can also microwave individual servings for 10 seconds.
Nutritional information is approximate and does not include optional toppings.