This is one I haven't tried yet - uses coconut flour.

90 Second Bread that Actually Tastes Good
by Kasey
Serves: 1

1 tablespoon coconut flour
1-1/4 tablespoon butter, melted
1 egg
1 teaspoon sour cream
1/4 teaspoon baking powder
1 tablespoon cheddar cheese, grated

Melt butter in a ceramic or glass bowl (Hers was about 6 inches).
Add the rest of the ingredients and whisk together until combined.
Cook in the microwave for 90 seconds.
Remove from the microwave and allow to cool for a minute or two.
Cut the bread in half like a bun (each side will be thin).

Heat a tablespoon of butter in a skillet and cook the 90-second bread on each side until crisp.

Nutrition information: 264 calories, 22.8 gms fat, protein 10.8 gms, carbs: 4-3 grams of fiber= 1 net carb (according to MyFitnessPal app).