Feel free to buy pre-made dulce de leche for this easy, cozy drink, or make your own by boiling a can of sweetened condensed milk for 3-4 hours! INSTRUCTIONS Line the rim of a 10-ounce coffee mug with dulce de leche. Using a spoon, swirl 1 tbsp dulce de leche along the inside of a 10-ounce coffee mug. Brew 2 ounces of the espresso directly into the mug. Meanwhile, add the remaining dulce de leche and whole milk to a frother and steam at the highest setting. Pour the frothed milk over the espresso. Top with whipped cream and more dulce de leche drizzle.