Preheat your oven to 350 degrees. Spray a 9X13 baking dish with non-stick cooking spray.
Next, place 10 bottom roll halves into the prepared baking dish. Take the mayo and mustard, and spread it all over the roll halves.
Take the corned beef and Swiss cheese and layer them on top of each dinner roll.
In a skillet preheated to medium-high heat melt 2 tbsp unsalted butter. Once melted add the cabbage, salt, and pepper. Cook the cabbage until softened about five minutes. Take the cooked cabbage and place it on top of the corned beef.
Take the top dinner rolls and place it on top of the cooked cabbage.
In a microwave safe bowl melt the remaining 2 tbsp unsalted butter. Once melted stir in the onion powder, garlic powder, salt, and pepper. Using a brush, brush the melted butter on top of each roll.
Bake the sliders for about 15 minutes or until the cheese has melted. Serve and enjoy!