Roast Beef Sliders - Cache Valley Creamery

Ingredients

• ⅔ cup mayonnaise
• 1 Tablespoon grated parmesan cheese
• ¼ teaspoon garlic powder
• ½ teaspoon black pepper
• ¼ teaspoon kosher salt
• 1 large yellow onion, sliced thinly
• 2 Tablespoons Cache Valley® salted butter
• 1 Tablespoon red wine vinegar
• ½ teaspoon kosher salt
• ¼ teaspoon black pepper
• 24-piece Hawaiian rolls
• 1 pound deli roast beef, sliced very thin
• 8 Cache Valley® provolone cheese slices
• 1 stick Cache Valley® salted butter
• 1 Tablespoon dehydrated minced onion
• 1 teaspoon garlic powder