Line a 8 x 8 inch square pan with parchment paper with extra paper hanging on the sides.
Melt ½ stick butter in microwave for a minute. You can also melt the butter on stove top. The butter should be just melted, do not over heat. Add ¾ cup of light brown sugar and whisk it for a minute.
Add ¼ cup room temperature yogurt and one teaspoon vanilla extract. Whisk for another minute.
Now add 1 cup of all purpose flour, ½ teaspoon baking powder, ¼ teaspoon baking soda, and ¼ teaspoon salt.
Gently fold in all the ingredients. If you feel the batter is too thick add 1-2 tablespoons of room temperature milk. Fold in ¼ cup chocolate chips.
Transfer the batter to the prepared pan and bake in a preheated oven at 350 F for 20-23 minutes until tooth pick inserted comes out clean. Do not over bake the blondies.
Cool the blondies completely before slicing.