White Castle Hamburgers The Original Sliders - 6 ct From Frozen: 1. Remove Sliders from plastic wrapper. 2. Place Sliders on a microwave-safe plate, with the bottom buns up, wrapped in a food grade paper towel with the open ends tucked under the top bun. 3. Microwave on a high setting (Based on 1200W microwave. Microwaves vary - adjust times accordingly to heat product.