Pat steaks dry, drizzle with oil, season with salt and pepper. Rest 15 minutes at room temperature.
Whisk together all cowboy butter ingredients in a bowl. Keep warm.
Grill steaks on high heat (450-500°F) for 4-5 minutes per side until medium-rare (130°F internal temp).
Toast slider buns cut-side down on grill for 1-2 minutes until golden.
Let steaks rest 5 minutes, then slice against grain into thin strips.
Build sliders with steak, cheese, and cowboy butter drizzle on bottom buns.
Brush top buns with extra cowboy butter before assembling.
Serve immediately while warm. Pair with coleslaw or grilled corn.
Notes
- Cowboy butter can be made 3 days ahead and refrigerated
- Use instant-read thermometer for perfect doneness
- Slice against grain for maximum tenderness
- For parties, arrange in baking dish and warm in 350°F oven for 5-10 minutes