Mix the two flours, baking powder, baking soda, salt and sugar.
In an other bowl, mix milk and sour cream.
Add to the flour preparation the butter cut into cubes. Scramble. Add the strawberries, cut in small pieces. Pour the milk/sour cream in the main preparation and mix with a spatula. You can knead with your hands, but don't it to much. You don't need to have a perfect homogenous dought.
Form a round/circle, flatten slightly. It must be about 2 inches thick. Cut in slices. Place on a baking sheet covered with baking paper and place in the oven for 30 minutes.