Add butter to a 4 inch wide ramekin and melt in the microwave for a few second until butter is completely melted. Swirl the melted butter around until it coats the entire bottom of the ramekin.
Add in remaining ingredients. Use a small whisk to mix until everything is evenly mixed. Make sure your egg is thoroughly combined and no egg white streaks remain.
Place muffin into microwave and cook for approximately 90 seconds at full power. Muffin should pull away from the sides of the ramekin when it is done. Let muffin cool before removing. You can use a spatula to help loosen the edges and bottom to remove the muffin when it has cooled.
Slice muffin in half. Toast muffin in a nonstick skillet over low heat until both sides are lightly browned. Serve with butter or other spreads of your choice.
Notes
If you use unsalted butter, add a pinch of salt to the batter.
My microwave is 1100 watts. Cooking time may vary depending on the wattage of your microwave.
If you are looking for a coconut flour version, I have a coconut flour version here.
The cooking time will vary if you use something other than a 4 inch wide ramekin.
If your skillet is not nonstick, make sure to grease it before toasting the muffin slices.
If you want to make your muffin look even more like a regular English muffin, you can dust the top and bottom with toasted almond flour (which I did in the photos).
The net carbs count excludes fiber. If you are on the keto diet, please remember to look at the net carbs and not just total carbs.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.