1. Begin by heating olive oil in a large skillet over medium-high heat. Add the sliced steak to the skillet, seasoning with salt and pepper. Cook for approximately 3-4 minutes per side, or until the steak reaches your preferred level of doneness.
2. While the steak is cooking, prepare the cowboy butter sauce. In a small bowl, mix together the melted butter, minced garlic, Dijon mustard, fresh lemon juice, chopped parsley, and crushed red pepper flakes. Stir well to combine all the flavors.
3. Once the steak is cooked, remove it from the skillet and let it rest for a few minutes. This step is crucial for retaining the juiciness of the steak, a tip I picked up from watching my abuela handle her meats with such care.
4. While the steak is resting, lightly toast the slider buns in the same skillet until they are golden brown. This not only adds flavor but also ensures the buns hold up against the juicy steak and buttery sauce.
5. To assemble the sliders, place a few slices of steak on the bottom half of each toasted bun. Drizzle with the cowboy butter sauce, then top with a handful of arugula. If you’re feeling indulgent, add a slice of cheese before placing the top bun.

These sliders are a testament to the idea that home cooking can be both simple and sensational. They remind me of the joy of creating something delicious and the satisfaction of sharing it with loved ones.