I take no credit for the creation of this recipe, I just discovered it and they're amazing! I substituted for Vanilla protein. I didnt use coconut flour, I used wholewheat flour, no cocoa, and 1% fat milk. As I was just desperate to try these!
Think they'd be good with a chocolate peanutbutter flavour!
Source: Rich Chocolate Protein Mug Brownie | Muffin Topless