Step 1: In a medium-sized bowl or large liquid measuring cup, pour in the entire can of sweetened condensed milk.
Step 2: Add the vanilla extract (or vanilla bean paste) to the sweetened condensed milk.
Step 3: Whisk the sweetened condensed milk and vanilla together until thoroughly combined and smooth.
Step 4: Gradually pour in 1.5 cups of your preferred milk (dairy or non-dairy) while continuously whisking until the mixture is smooth and homogenous. Ensure there are no streaks of the thicker condensed milk.
Step 5: If you prefer a thinner consistency, add the remaining 0.5 cup of milk, a little at a time, whisking well after each addition, until your desired consistency is reached. Taste and adjust sweetness if desired, by adding a tablespoon or two of sugar or maple syrup, dissolved thoroughly.
Step 6: Pour the finished homemade coffee creamer into an airtight container, such as a glass jar or bottle. Store in the refrigerator.
Step 7: Refrigerate for up to 10-14 days. Shake well before each use to reincorporate any natural separation. Enjoy in your favorite coffee!