Ground Beef Mixture:

• 2 teaspoons olive oil
• 1 pound lean ground beef (10% fat) or medium ground beef (20% fat)
• 1 medium onion, finely chopped
• 2 tablespoons mayonnaise (regular or light)
• 2 tablespoons BBQ sauce or ketchup
• 1/2 teaspoon garlic powder
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper

Sliders:

• 2 tablespoons butter
• 2 teaspoons Dijon mustard
• 1 tablespoon brown sugar or maple syrup
• 2 teaspoons sesame seeds or Everything Bagel Seasoning
• 12 Hawaiian rolls (1 package)
• 8 slices cheddar cheese or 6–8 ounces shredded cheese
• 1 tablespoon soft butter (for greasing the pan)