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In a large mixing bowl, combine the butter, sugar, and vanilla extract. Mix until combined.
Add the oat flour, coconut flour, and pinch of salt, then mix everything together. Note that we have not added the protein powder yet.
Add the protein powder last and mix. If you use a whey/casein blend protein powder as I did, you're going to need a bit more liquid. Add in one tablespoon of milk and continue to mix. It's going to resemble a crumb, but keep mixing (and don't be afraid to use your hands) until it becomes a ball of dough.
Fold in the sprinkles.
Remove the dough onto some parchment paper. Separate into 3 roughly equal-sized pieces, then shape into bars. I simply use my hands to shape them into a bar, then flip them over to reveal the flattened top.
At this point, you can add toppings, but it's optional. I melted down some white chocolate in the microwave (I did not measure how much I used) and then added a splash of milk to thin it out. I drizzle that over my bars, then topped with some additional sprinkles.
The bars are technically ready to eat right away, but the flavors really develop once everything settles. Add your bars to the fridge for at least 2 hours, but I found the best results when leaving them overnight. The sweetness level decreases as these sit and will taste much sweeter if eaten right away.