Add muffin liners to muffin tin.
Combine almond flour, sweetener, oat fiber, cocoa, baking powder, xanthan gum and salt in a large bowl. Mix well.
In a separate medium bowl, beat the egg until light yellow. Add heavy whipping cream, olive oil and optional red coloring.
NOTE - it is ok if it looks dark pink, it will get redder when you combine with the darker ingredients.
Add egg mixture to dry mixture and continue mixing. You can add more coloring if you want now, but it will get darker even when you bake it.
Evenly add the mixture to muffin tins, filling about 2/3 to the top.
Bake for 20 minutes or until the toothpick test comes out clean.
Let muffins cool.
NOTE - the center will start to fall in. Don't panic, that is what we want. And if it doesn't, no biggie either!