In a microwave-safe jar or mug, combine the almond flour (or coconut flour), baking powder, and a pinch of salt.
Crack in the egg and add the olive oil (or melted butter) and water (or milk). Mix well until you have a smooth, thick batter.
If using optional add-ins like herbs or seeds, stir them into the batter now for extra flavor and texture.
Smooth the batter into the jar or mug, ensuring it’s evenly spread.
Microwave on high for 60 seconds (adjust time slightly based on your microwave’s power). The bread will rise slightly and become firm.
Let the bread cool for 1–2 minutes before slicing or removing it from the jar.
Slice it in half for a mini sandwich, toast it for extra crunch, or enjoy it as-is with your favorite toppings.
