Mushroom Sliders

• 1 pound lean ground beef, or more to taste
• 1 large egg
• 1 small onion, finely chopped
• 1 cup finely chopped mushrooms
• 1 teaspoon ground black pepper
• 1/2 teaspoon garlic salt
• salt to taste
• 6 portobello mushrooms, or more to taste
• 1 green bell pepper, halved and seeded
• 1 red bell pepper, halved and seeded
• 1 yellow bell pepper, halved and seeded

1. Preheat an outdoor grill for medium-high heat and lightly oil the grate.
2. Mix ground beef, egg, onion, and chopped mushrooms together in a bowl, seasoning with pepper, garlic salt, and salt as you mix. Form mixture into patties about 2 inches in diameter.
3. Grill patties on the preheated grill until browned and desired doneness is reached, 5 to 7 minutes per side. An instant-read thermometer inserted into the center should read at least 160 degrees F (70 degrees C).
4. Grill portobello mushrooms, green bell pepper, red bell pepper, and yellow bell pepper on the grill until tender, 3 to 5 minutes per side. Use 2 mushrooms and as the 'bun' for the burgers.

ground beef, egg, onion, mushrooms, ground black pepper, garlic salt, salt, portobello mushrooms, green bell pepper, red bell pepper, yellow bell pepper

Taken from www.allrecipes.com/recipe/239883/mushroom-sliders/ (may not work)