In a mixing bowl, combine the yogurts with the vinegar. Let it sit for 10 minutes. Add the egg, salt, sugar and garlic powder. Mix well.
Sift in the flour and baking powder. Blend until smooth. The batter should be thick and fall in ribbons, just like pancake batter. Do not overwork the batter to avoid making it too runny.
Note : To avoid a runny batter, as flour can absorb liquids differently, start by adding 2 yogurts and gradually add the third one.
Place in a piping bag to pipe mini blinis. You can use a spoon to drop small bite-sized portions.
Heat a large frying pan and grease it with a small piece of butter. Squeeze small portions of batter, about 3 to 5 cm (1 to 2 inches) in size, and gently tap the frying pan to smooth the surface of the batter.
Cook them for 1 to 2 minutes, until bubbles appear and the top of the batter is slightly dry. Flip them over and cook until they are golden brown.
Place them on a plate lined with paper towels.
Let them cool before packing them in a freezer bag. You can keep them for 2 to 3 days in the refrigerator or 1 month in the freezer.