Prepare the Steak: Freeze the steak for about 20 minutes until firm but not fully frozen. This makes it easier to slice. Thinly slice the steak against the grain.
Preheat the Oven: Preheat your oven to 350°F.
Make the Parsley Butter: In a small bowl, combine the softened butter, parsley, minced garlic, a pinch of salt, and a pinch of pepper. Set aside.
Cook the Vegetables: Warm 2 tablespoons of olive oil in a large skillet over medium-high heat and add the sliced onion and bell pepper, then season with 1/2 teaspoon of salt then Cook, stirring occasionally, for about 10 minutes, or until the onions are tender and golden. Transfer to a plate.
Cook the Steak: In the same skillet, warm the remaining 1 tablespoon of oil over medium-high heat and add the steak slices and season with the remaining 1 teaspoon salt and 1/4 teaspoon pepper then Cook for about 5 minutes, tossing occasionally, until browned and just cooked through. Return the cooked veggies to the skillet, toss to combine, and warm through. Remove from heat.
Assemble the Sliders: Using a serrated knife, slice the slider rolls in half horizontally. Arrange the bottom halves on a baking sheet and spread a smooth, even layer of mayonnaise on them add top with the steak and vegetable mixture, then layer with provolone cheese slices then Close the sliders with the top halves of the buns.
Add Parsley Butter and Bake: Brush the tops of the buns generously with the prepared parsley butter and Bake in the preheated oven for 10 to 12 minutes, or until the cheese is melted and the buns are golden brown.
Serve Warm: Remove from the oven and serve immediately. Perfect for game days, parties, or a hearty snack!
Enjoy the savory, cheesy goodness of these cheesesteak sliders!