Create tasty and bite-sized beef and mushroom sliders using your food processor. Start by pulsing mushrooms, onions, and garlic in the food processor until finely chopped. In a skillet, brown ground beef and then add the chopped mushroom mixture. Cook until the beef is fully cooked and the mushrooms are tender. Season with Worcestershire sauce, salt, and pepper for added flavor. Toast slider buns and assemble the sliders by placing a spoonful of the beef and mushroom mixture on each bun. Top with your favorite condiments like cheese, lettuce, and tomato. These sliders make a perfect appetizer or a fun dinner option.