Sauté the Vegetables: Heat olive oil in a large skillet over medium heat. Add sliced onions and bell peppers. Sauté for 5-7 minutes until soft and slightly caramelized. Add minced garlic and cook for 30 more seconds. Remove from the pan and set aside.
Cook the Steak: In the same skillet, add the thinly sliced steak. Season with salt, black pepper, and Worcestershire sauce. Cook for 3-5 minutes until browned and cooked through.
Combine Everything: Return the sautéed vegetables to the skillet and mix with the cooked steak. Stir until everything is evenly combined and heated through.
Preheat the Oven: Set the oven to 350°F (175°C).
Slice the Buns: Carefully slice the slider buns in half without separating them completely. Place the bottom half in a greased 9×13-inch baking dish.
Layer the Ingredients:
Prepare the Butter Topping: In a small bowl, mix the melted butter with garlic powder, onion powder, sesame seeds (if using), and dried parsley.
Brush the Sliders: Generously brush the butter mixture over the top of the buns.
Bake the Sliders: Cover the dish with foil and bake for 10 minutes. Remove the foil and bake for another 5-7 minutes until the tops are golden brown and the cheese is fully melted.
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