Before starting to prepare your protein muffins, preheat the oven to 180 ºC.
Start by adding the coconut flour or oat flour, the eggs, the baking powder, the banana, the vanilla-flavored vegan protein, and the milk (or water) to the mixer. Let everything mix until well combined.
Then slowly add in the previously melted coconut oil, peanut butter, and if you want the vanilla extract to the mixer. Let it mix until you get a uniform paste.
While that is mixing, cut your plum into slices.
Now, place the mixture into muffin molds or muffin tin and add some plum slices on top. Be sure to not overfill your muffin molds as it will need space to rise.
Lastly, place the molds or muffin tin into the oven and increase the heat to 250ºC and let back for 20-30 minutes. If you’re not sure if the muffins are ready or not, a trick you can use is to stick a toothpick or knife in the middle of the muffin and see if it comes out dry. If it does, they are baked and ready to take out.