Step 1: Combine Ingredients: In a large, heavy-bottomed pot, mix the milk, sugar, and baking soda. Cook over low heat, stirring constantly to prevent burning.

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

Step 3: Flavor: Stir in the vanilla extract.

Step 4: Cool: Let the dulce de leche cool, then transfer to a jar. It will thicken further as it cools.

Step 5: Pro Tips:

Step 6: Stir continuously and keep the heat low to prevent the milk from burning and sticking to the bottom of the pan.

Step 7: A drop of vanilla extract added at the end of cooking enhances the flavor.