In a bowl, add the dry ingredients: wheat flour (1 Cup), oat flour 1/2 Cup, baking powder (1 package). Mix the dry ingredients. I would like to draw your attention to the fact that you may need a little more flour. Flour is different. Next, you need to look at the consistency of the dough, it should be easy to work and roll out well.
In a separate bowl, add butter at room temperature (100 gr.), sour cream (2 tablespoons), sugar (1/2 Cup) RUB the mixture with a cooking spatula until smooth and smooth.
Add the egg (1 PC.) and lemon juice (2 tbsp.) to the oil mixture. The mixture is stirred.
Then add a mixture of dry ingredients. Zamesit dough.
Then roll out the dough into a layer 1-1. 2 cm thick. Cut out figures with a cookie cutter.
Place the cookies on a baking sheet covered with baking paper. Cookies smear with beaten egg, sprinkle with sugar and set in a preheated oven to 190-200C.