Slow Cooker Onion Butter Potatoes Recipe Ingredients 3 pounds small red potatoes, scrubbed and quartered 1/2 cup (1 stick) unsalted butter, melted 2 (1-ounce) packets dry onion soup mix Directions Prepare the potatoes first. Rinse the red potatoes under cool water and scrub off any dirt. Pat them dry with a towel, then cut each potato into quarters so the pieces are all roughly the same size. This helps them cook evenly and get tender all the way through. Lightly grease the inside of your slow c