Preheat the oven to 175 degrees Celsius.
Line a parking pan with 7 muffins tins.
Whisk eggs and sweetener in a bowl until a little fluffy.
Add the apple sauce, greek yogurt, fiber syrup/agave/honey and vanilla extract and whisk again until combined.
Combine oat flour, coconut flour, baking soda, baking powder in a separate bowl and stir to combine.
Add the dry ingredients to the wet and mix until combine.
Cut the rhubarb into small pieces and fold into the batter.
Add cream cheese and sweetener to a bowl and mix using a hand mixer until fluffy.
Fill the muffin tins 1/3 of the way.
Add about one tsp of the cream cheese filling to each tin.
Top up the muffin tins with the rest of the batter.
Divide the rest of the cream cheese filling on top of the muffins.
Add rhubarb stalks on top and drizzle with more xylitol (optional).
Bake in the oven for 18-20 min.