While reading through the recipesI noticed 1 tablespoon of baking powder for 1 1/2 cups flour. The maximum that amount of flour should take is 1 1/2 teaspoons based on 1 teaspoon baking powder per cup of flour.
The bigger problem is the 350 grams of flour stated after the 1 1/2 cup. 350 grams of flour equals 2 1/2 cups based on the standard 140 grams per cup of all purpose flour.
Helen S. Fletcher