In a small pot, combine milk, dulce de leche, sugar, and optional heavy cream. Heat over medium heat, whisking frequently, until milk is just beginning to steam. Whisk until well-combined and milk is frothy.
Pour coffee into an 8-ounce mug, and stir in milk mixture. Top with optional whipped cream, and drizzle with more dulce de leche if desired.
Serve and enjoy!
Notes
*If you sometimes find coffeehouse drinks too sweet, omit the sugar to start and add sugar to taste after mixing everything together if the drink is not sweet enough.This recipe makes a little over 1 cup of coffee, enough to fill one 8-ounce mug. If you want to fill an over-sized mug, double the recipe.