In a bowl, mix the yogurt and baking soda and let them fizz briefly. This ensures that the baking soda is evenly activated before mixing with the other ingredients.
To the frothed yogurt, add the eggs, sugar, vanilla, and rakia. Mix the mixture with a mixer until smooth and homogeneous.
Add the sifted flour gradually, in parts, stirring constantly. This avoids lumps and controls the consistency.
The final dough should be soft and sticky. This is the desired result — do not add extra flour, because the buhtichki will become tough.