Mix sugar and cookie crumbs together. Toss in melted butter. Press mixture into a 8x8-inch square pan.
cake
Cream together egg, brown sugar, vanilla and yogurt. In a separate bowl mix together flour, salt, baking powder and baking soda. Stir dry and wet ingredients together.
Pour batter over cookie base.
Bake at 350 for 30 to 40 minutes until an inserted toothpick comes out clean.
Cool the pan on a wire rack. Wait until blondies are completely cooled to cut.
Recipe by Cindy's Recipes and Writings at https://www.cindysrecipesandwritings.com/chocolate-crumb-bottom-blondies/