Firehouse Sliders | Command Cooking

Ingredients

• 2 tablespoons unsalted butter, melted, plus more, to taste, for greasing the baking sheet
• 1/2 tablespoon olive oil
• 1/2 large yellow onion, finely diced
• 2 pounds lean ground beef
• 1 teaspoon salt
• 1 teaspoon black pepper
• 1 teaspoon garlic powder
• 1/4 cup mayonnaise
• 24 dinner rolls, split
• 8 slices medium cheddar cheese
• 6 ounces medium cheddar, shredded
• 1 tablespoon sesame seeds