Bacon Cheeseburger Sliders

Name: Bacon Cheeseburger Sliders
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: American, Southern
Ingredients: 1 lb lean ground beef; 1 medium onion (diced); olive oil; 12 oz package thick cut bacon (cooked and drained and chopped or crumbled); 12 dill pickle slices; 2 tsp steak seasoning i.e. Montreal, Chicago or similar; 1 tsp salt (adjust amount to taste); 1 tsp garlic powder; 1 Tbsp Worcestershire sauce; 12 slices cheddar or American cheese; ketchup; yellow mustard; 1 12 count package sweet Hawaiian rolls; 4 Tbsp butter (melted); 2 tsp sesame seeds