I bake my own bars regularly. I like to replace half of the flour with protein powder. The added protein stays with you for a while. When you find a recipe you like, treat it as a base and add raisins, sunflower seeds, chocolate chips or whatever you like. Mix it up!
Here is the recipe I like (yes, I googled it)--
Ingredients
2 cups rolled oats
3/4 cup packed brown sugar
1/2 cup wheat germ
3/4 teaspoon ground cinnamon
1 cup all-purpose flour (I do half flour/ protein powder)
3/4 cup raisins (optional)
3/4 teaspoon salt
1/2 cup honey
1 egg, beaten
1/2 cup vegetable oil
2 teaspoons vanilla extract
Directions
Preheat the oven to 350 degrees F (175 degrees C). Generously grease a 9x13 inch baking pan.
In a large bowl, mix together the oats, brown sugar, wheat germ, cinnamon, flour, raisins and salt. Make a well in the center, and pour in the honey, egg, oil and vanilla. Mix well using your hands. Pat the mixture evenly into the prepared pan.
Bake for 30 to 35 minutes in the preheated oven, until the bars begin to turn golden at the edges. Cool for 5 minutes, then cut into bars while still warm. Do not allow the bars to cool completely before cutting, or they will be too hard to cut.