Begin by selecting a large microwave-safe mug and combine 4 tablespoons of all-purpose flour, 1/8 teaspoon of baking powder, and a pinch of salt. Mix thoroughly.

Pour in 3 tablespoons of milk and 1 tablespoon of olive oil or melted butter. Stir until you achieve a smooth, lump-free batter.

Place the mug in the microwave and cook on high for about 1 to 2 minutes. Start checking at 1 minute to prevent overcooking.

After cooking, carefully remove the mug and allow the bread to cool in the mug for about 1 minute.

Run a butter knife around the edges of the mug to loosen the bread, then invert onto a plate. Slice and serve warm.