Bison Burger Sliders

Ingredients

• 12-pack KING’S HAWAIIAN Original Hawaiian Sweet Rolls
• 6 tbsp HEINZ Yellow Mustard
• 5 slices American cheese
• 1 small red onion, peeled and sliced into rings
• 1 1/2 pounds ground bison
• ½ Tablespoon black pepper
• ½ teaspoon garlic powder
• 3 tbsp butter
• 1 tbsp Worcestershire sauce
• 1 tsp kosher salt
• 1/2 tsp ground black pepper
• 1 tsp onion powder
• 2 tbsp canola oil
• 4 large lettuce leaves, torn to slider sized pieces
• 9 skewers