Mix sour cream with sugar and 1/4 tsp of salt. Whisk soften butter, add sour cream step by step. Then pour flour, mixed with soda and knead the dough quickly.

Then roll out the dough into a layer, cut into stripes, season with salt, mixed with thyme, arrange on greased baking tray and bake for 10-12 minutes over 430-445°F.