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Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius).
In a saucepan, heat the French Onion Soup and water over medium heat until warmed through.
Add the roast beef to the pan with the French Onion Soup and heat until warmed.
Place the bottom half of the slider buns on a rack set inside a baking pan. Top the buns with the slices of Provolone cheese.
Arrange the heated roast beef slices on top of the cheese, distributing them evenly across the buns.
Using a slotted spoon, remove the onions from the soup and spread them over the roast beef.
Place the bun tops on the sliders.
In a microwave-safe dish, melt the unsalted butter. Stir in the kosher salt and garlic powder until well combined.
Use a basting brush to brush the melted butter sauce evenly over the bun tops.
Optional: Garnish with chopped parsley for an added touch of freshness.
Bake the assembled sliders in the preheated oven for about 5 minutes, or until the cheese is melted and the buns are lightly toasted.
Remove the sliders from the oven using oven mitts.
Serve the French Dip Sliders warm with the au jus (leftover soup) and enjoy!