Preheat the oven to the low broil setting. Slice the slider buns and arrange them, cut-side up, on a baking sheet. Lightly toast under the broiler until golden, monitoring closely to avoid over-browning.
Cook the Steak
In a large skillet, heat the olive oil over medium-high heat. Add the sliced ribeye steak, season with salt and pepper, and cook until browned. Remove from the skillet and set aside.
Sauté the Vegetables
Using the same skillet, add the onion, green pepper, and mushrooms. Sauté until softened and fragrant, stirring occasionally to ensure even cooking.
Combine and Season
Return the steak to the skillet with the vegetables. Add the Worcestershire sauce and chicken broth. Continue cooking until the liquid has reduced and the mixture is well combined.
Assemble the Sliders
Evenly distribute the steak and vegetable mixture over the bottom halves of the toasted buns. Top with shredded mozzarella cheese.
Melt the Cheese
Place the sliders back under the broiler for 1–2 minutes, or until the cheese is melted and bubbly.
Serve
Cover with the top halves of the buns and serve immediately while hot.
Notes
To make this recipe gluten-free, use certified gluten-free slider buns and a gluten-free Worcestershire sauce. Ensure the chicken broth is also labeled gluten-free, as some brands may contain hidden gluten.