Preheat the oven to 325ºF and grease a mini muffin pan (24 cavity pan) very well. You can also use silicon or parchment paper liners.
In a large bowl, whisk together the almond flour, sweetener, protein powder, baking powder, cinnamon, and salt. Whisk in the eggs, butter, and apple extract until well combined. Whisk in the water a little at a time until you have a nice scoopable batter.
Divide the mixture evenly among the wells of the prepared mini muffin pan.
Bake 15 to 20 minutes, until muffins are firm to the touch. Remove and let cool 15 minutes, then transfer to a wire rack to cool completely.
In a small bowl, whisk together the sweetener and cinnamon. Dip each donut bite into the melted butter, coating completely and shaking off the excess. Then roll each donut bite into the cinnamon/sweetener mixture.
Notes
Storage Information: You can store the bites in a covered container on the counter for up to three days or in the fridge for a week. You can also freeze them for several months.