Best Philly Cheesesteak Sliders Recipe - How To Make Cheesesteak Sliders

Ingredients

• 1 1/2 lb. boneless ribeye steak (about 2 [3/4"-thick] steaks)
• 2 tbsp. unsalted butter, melted
• 1 tbsp. chopped fresh parsley leaves
• 1 clove garlic, finely chopped
• 1 1/2 tsp. kosher salt, divided, plus more
• 1/4 tsp. freshly ground black pepper, plus more
• 3 tbsp. vegetable oil, divided
• 1 medium yellow onion, sliced into half-moons (about 1 1/2 c.)
• 1 large green bell peppers, seeds and ribs removed, thinly sliced
• 12 mini Hawaiian rolls
• 1/4 c. mayonnaise
• 8 slices American or provolone cheese