Roast Beef Sliders

Name: Roast Beef Sliders
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 2/3 cup mayonnaise; 1 Tablespoon grated parmesan cheese; 1/4 teaspoon garlic powder; 1/2 teaspoon black pepper; 1/4 teaspoon kosher salt; 1 large yellow onion (sliced thinly); 2 Tablespoons Cache Valley® salted butter; 1 Tablespoon red wine vinegar; 1/2 teaspoon kosher salt; 1/4 teaspoon black pepper; 24 piece hawaiian rolls; 1 pound deli roast beef (thinly sliced); 10 slices Cache Valley® provolone cheese slices; 1 stick Cache Valley® salted butter; 1 Tablespoon dehydrated minced onion; 1 teaspoon garlic powder