Instructions

Preheat oven to 350 degrees. Lightly spray a 9-by-13-inch baking pan and a cookie sheet with nonstick spray.
Mix together the protein powder, flour, oats, oat bran, cinnamon and salt in a bowl. Crumble in the brown sugar, rubbing it with your fingers to break up any clumps. Stir in the chocolate chips.
Mix the yogurt, oil and vanilla in a second bowl until well-combined. Add the wet mixture to the dry and mix patiently until thoroughly blended. (You may have to use your hands; it will be a thick batter/dough.)
Transfer the mixture to the prepared pan, patting it evenly into place with your hands. Bake in the center of the oven for 15 minutes, then remove from the oven and cut into bars of any size or shape. Place the bars on prepared cookie sheet and bake anaother 15 minutes, or until golden around the edges. Remove the bars from the oven and place them on a rack to cool.
Eat them within a few hours or seal them in a plastic bag and store them in the freezer. Bars can be recrisped in a toaster oven.