Melt the butter, ghee, or coconut oil in a small glass rectangular container.
Meanwhile, in a small bowl, stir together the almond flour, psyllium husk powder, baking powder, and sea salt.
Add the flour mixture to the melted butter, then whisk in the egg and stir everything together until smooth. Level the top with the back of a spoon.
Microwave Method: Microwave for about 90 seconds, until firm.
Oven Method: Bake for about 15 minutes at 350 degrees F (177 degrees C), until firm.
Run a knife along the edges, then flip onto a plate or paper towel to release.
Cut in half to form two thick slices. You can slice each piece in half for thinner slices if desired.
Toast in a toaster for best results (highly recommended). This improves texture and reduces any egg-y flavor.