1 - Combine Ingredients: In a large, heavy-bottomed pot, mix the milk, sugar, and baking soda.

2 - Cook over low heat, stirring constantly to prevent burning.

3 - Thicken: Continue to cook, stirring frequently, until the mixture becomes thick and caramel-colored, about 1-2 hours.

4 - Flavor: Stir in the vanilla extract.

5 - Cool: Let the dulce de leche cool, then transfer to a jar.