Cream butter and sugar for about 5 minutes.
Then add 1 egg at a time and continue mixing. Add vanilla sugar, salt and powder with soda mixture.
Slowly add the flour into mixture.
Add strawberries and incorporate with a wooden spoon.
If too runny, add another tbsp of flour and mix well.
Pour into greased 9x13 pan.
Mix topping ingredients and sprinkle over top.
Bake on 365F for 25-35 minutes.
Check with toothpick if center cooked thru.
Sprinkle with powdered sugar when cool.