In a small bowl, combine the sour cream substitute (or tofu combined with white vinegar) and milk substitute until mixture becomes smooth. (glutenfreeandmore.com)
Increase mixer speed to medium - high, and beat until dough becomes smooth and elastic, 2 to 3 minutes. (bakefromscratch.com)
Secure the lid on the food processor and process until the mixture becomes a smooth paste. (budgetbytes.com)