Roast Beef Sliders with Caramelized Onions

So comforting an delicious!  These are a great addition to a party or just as a meal.  Make the sandwiches in advance and even pour the butter sauce on top, then refrigerate and bake off before your party.  Everyone will love these!

Roast Beef Sliders with Caramelized Onions

Ingredients

• 6 Tbsp. butter, divided
• 2 sweet onions, sliced
• 1/4 cup brown sugar
• 2 tsp. Worcestershire sauce
• 1 Tbsp. onion flakes
• 1/4 cup mayonnaise
• 2 Tbsp. Coleman's mustard
• 1 Tbsp. honey
• 1 Tbsp. horseradish
• 24 brown 'n' serve rolls
• 1 lb. sliced roasted beef
• 1 lb. smoked white cheddar, sliced if you can find it, just shred it if you can't find it sliced

Makes 24 sliders
Cook time: 30 minutes

In a medium skillet, melt butter over medium heat, when melted add onions to caramelize for about 30 minutes (they do no need to be completely caramelized like when you make French Onion Soup; a little bite in them is good).
Meanwhile, in a small sauce pan combine remaining butter, brown sugar, Worcestershire sauce, and onion flakes.  Allow to melt and come together; keep on low as you make the sliders.
While the butter mixture melts, combine mayonnaise, mustard, honey and horseradish.  Slice you buns in crosswise (these are usually connected so I slice through them like they are one big sheet) and put the bottom bun "sheets" in a large, rimmed baking sheet.  Spread mayonnaise mixture on bottom of buns, top with roast beef, then cheese, and finally top with the caramelized onions.  Put the tops on and pour the butter mixture over them.  Bake 20 minutes covered, uncover and bake another 10 minutes.