Source: Serious Eats
Dulce de Leche
Adapted from Make it Fast, Cook it Slow by Stephanie O'Dea.
2 (14-ounce) cans sweetened condensed milk
Oven safe ramekins
Use a 4-quart slow cooker. Find an oven-safe dish to insert into your stoneware. You can use individual ramekins or a casserole dish. Carefully pour water all around the dish, until the water reaches three-quarters of the way up the sides of the dish. Open the cans of sweetened condensed milk and pour into the inserted dish(es). Cover and cook on low for 8 hours.