Preheat oven to 375 F.

Separate the egg whites from the yolks.

Add cream of tartar to the whites and beat until soft peaks form.

In a food processor, mix together egg yolks, 1/3 beaten egg whites, butter, almond flour, baking powder and salt.

(Adding a few drops of liquid stevia reduces the mild egg taste.)

Mix well, forming a lumpy, thick dough.

Add remaining 2/3 egg whites and gently process until fully incorporated.

Be careful not to over mix! This is what gives the bread volume!

Pour mixture into a buttered 8 x 4 inch loaf pan.

Bake 30 minutes, or until a toothpick/fork slides out clean.

Cool on a baking rack, then slice.