French Onion Sliders
French Onion Sliders are full of roast beef, swiss cheese, Dijon mustard, caramelized onions, and the flavor of France, with a buttery toasted bun. These are perfect for any family celebration!
Servings: 20 sliders
Equipment
- 1 9x13 baking sheet
Ingredients
Caramelized Onions:
- 2 Tablespoons unsalted butter
- 1 medium yellow onion thinly sliced
- 1 Tablespoon Herbes de Provence
- 1 Tablespoon water
- Salt and Pepper to taste
Topper Sauce:
- 5 Tablespoons unsalted butter melted
- 1 teaspoon Worcestershire sauce
- 2 Tablespoons mayonnaise
- 1 teaspoon Dijon mustard
- 1 clove minced garlic
The Sliders:
- 20 Hawaiian slider buns
- 6 Tablespoons Dijon mustard
- 1 pound deli roast beef
- 20 2x2 slices Swiss cheese
Garnish:
- 1 Tablespoon toasted sesame seeds
- 1 Tablespoon freeze-dried parsley
Au Jus Sauce:
- 1 Tablespoon unsalted butter
- 1 clove minced garlic
- 1 cup beef broth
- 1 Tablespoon Worcestershire sauce
- 1 Tablespoon dried parsley
- salt and pepper to taste
Instructions
Caramelized Onions:
- In a large skillet and over medium-high heat, melt butter. Add onion and Herbes de Provence, water, salt and pepper.
- Stirring occasionally, cook onions until they are tender and soft and becoming golden brown.
- Then continue to cook until they are caramelized, about 20 minutes. Remove from heat.
Topper Sauce:
- In a small microwave safe bowl, melt 5 Tablespoons butter.
- Add Worcestershire sauce, mayonnaise, Dijon mustard, and garlic. Mix well and set aside.
- If sauce thickens, microwave for 10 seconds to re-melt butter.
The Sliders:
- Preheat oven to 350° F. Spray 9x13 baking sheet with non-stick spray.
- As a group, slice Hawaiian slider buns in half, lift off the tops (as a group), and set aside. Place slider bottoms (as a group) into a 9x13 baking sheet.
- Spread an even layer of Dijon mustard on the bottom half of each bun.
- Top with a layer of deli roast beef and a slice of Swiss cheese. Top with caramelized onions.
- Return tops of slider buns to the sandwich.
- With a pastry brush, spread sauce over the tops of the buns until the sauce is gone. Immediately sprinkle with sesame seeds and parsley.
- Loosely cover with foil. Bake at 350° F for 20-30 minutes, or until the cheese is melty.
- Remove foil and bake for another 5 minutes or until golden brown.
Au Jus Sauce:
- In a small saucepan, melt butter. Add minced garlic and toast for 1 minute, or until golden. It burns easily, so watch closely.
- Add beef broth, Worcestershire sauce, and parsley. Continue to cook until warm.
- Add salt and pepper to taste. Serve warm.
Notes
To reheat, place sliders on a baking sheet, cover with foil, and bake at 350° F for 12 minutes.