Preheat oven to 350 degrees. Line a baking sheet with foil.
Spread half of Thousand Island dressing on bottom of slider buns. Place on prepared baking sheet.
Top each with a 1/2 a slice of Swiss cheese, corned beef, sauerkraut, and the other 1/2 slice of Swiss cheese. Spread remaining Thousand Island dressing on the other part of the slider buns. Place on top of sandwich.
Pour melted butter over sliders. Cover with foil. Bake for 15-20 minutes in preheated oven.