Pre heat oven 350. Melt 3 tablespoons of butter. Saute your onions. I chopped mine this time but you can julienne them also. Saute for a while to get them sweet . Be patient with your onions, good things come to people who wait.

Chop bell peppers, jalapeños, and mushrooms. Mince garlic. Add ingredients to pan . Saute for a couple minutes. Add salt pepper to taste.

Add roast beef and fold in. Continue to warm in the pan and stir to mix all together.

Grease a baking sheet. Cut Hawaiian rolls in half. Place bottom rolls on baking sheet. Add slices of cheese to buns.

Add half meat mixture to bottom half and spread out. Top with slice of cheese, add other half of buns.

Melt 2 tablespoon of butter in a small bowl and wisk in garlic powder. Brush on top of buns and sprinkle sesame seed on top. I did a second kind of topping for the other 12 sliders. Whisk melted butter, Worcester, dijon mustard and garlic powder. Topped with popseed