https://www.bakedbyrachel.com/snickerdoodle-blondie-bars/. Ingredients. 1 C unsalted butter softened. 1 C granulated sugar. 1 C light brown sugar. 2 large eggs. 1 1/2 tsp vanilla extract. 1/2 tsp salt. 1 tsp baking powder. 1 1/2 tsp cinnamon. 2 1/2 C all purpose flour. Topping:. 1/4 C granulated sugar. 1 1/2 tsp cinnamon. Instructions. Preheat oven to 350°F. Line a 9x13 inch baking pan with parchment paper. Lightly grease exposed pan and parchment paper. In a large bowl or stand mixer, cream together butter and sugars. Mix in eggs and vanilla, followed by dry ingredients. Mix until smooth and no streaks remain. Lightly grease hands, press mixture into an even layer in prepared baking pan. Sprinkle with cinnamon-sugar topping mixture. Bake for 25-30 minutes. Allow blondies to cool before slicing. Store in an airtight container for up to several days. Notes. Recipe serves roughly 12-16.