Step-by-step instructions
Let’s get cooking! Here’s how you’ll put it all together:
- Preheat your oven to 350°F (175°C).
- Caramelize the onions: In a skillet, melt 3 tablespoons of butter over medium heat. Add the sliced onions, thyme, garlic, sugar, salt, and pepper. Cook until the onions are beautifully caramelized and golden, about 15-20 minutes.
- Prepare the buns: Slice the slider buns in half and place the bottom halves in a baking dish.
- Layer the fillings: Spread the deli roast beef evenly over the bottom buns, followed by a layer of Swiss cheese, and then add the caramelized onions.
- Top it off: Place the top halves of the buns on the assembled sliders and brush the remaining melted butter over the tops.
- Add the soup mix: In a separate bowl, mix the French onion soup and Au Jus mix together. Drizzle this mixture over the sliders generously.
- Bake: Cover the dish with foil and bake for 20-25 minutes until heated through and the cheese is melted.
- Serve: Enjoy these sliders warm, paired with extra Au Jus for dipping.
Best ways to enjoy it
French Dip Sliders are best when served hot and fresh. Pair them with crispy baked fries or a light salad for a balanced meal. You could even add a side of coleslaw for crunch or sweet potato wedges for a flavor twist that complements the savory goodness of the sliders.
How to store
If you have any leftovers (which might be unlikely!), you can keep them fresh in an airtight container in the refrigerator for up to 3 days. When reheating, place them in the oven at a low temperature to maintain the bun’s softness. For longer storage, you can freeze the assembled, uncooked sliders. Just wrap them well in plastic wrap and foil before freezing.
Helpful cooking tips
- Time-saver trick: Use store-bought caramelized onions if you’re short on time.
- For extra flavor: Try seasoning your roast beef directly or adding spicy mustard into the buns.
- Broiler finish: If you like a crispy top, broil the sliders for a minute or two after baking until golden.
Creative twists
Feeling adventurous? Switch up your flavors by adding sautéed mushrooms or jalapeños for some heat. For a healthier version, try using turkey or chicken in place of the beef, and opt for a lighter cheese option.
FAQ
What’s the prep time for French Dip Sliders?
Typically, they take about 15-20 minutes to prep, and an additional 20-25 minutes to bake.
Can I use different types of cheese?
Absolutely! While Swiss cheese is traditional, provolone or cheddar can also add a nice flavor twist.
How do I make the sliders ahead of time?
You can assemble the sliders in advance, cover them well, and store them in the fridge for up to 24 hours before baking. Just add a few extra minutes to the baking time if they’re cold from the fridge!






