01 - In a medium bowl, whisk together all-purpose flour, baking powder, granulated sugar, and sea salt until thoroughly combined.
02 - In a separate bowl, whisk together Greek yogurt, large egg, melted unsalted butter, lemon zest, and vanilla extract until smooth.
03 - Add the wet ingredients to the dry ingredients and stir until just combined, ensuring not to overmix.
04 - Divide the batter evenly between two standard 12-ounce microwave-safe mugs. Gently fold in fresh blueberries into the center of each portion.
05 - Microwave each mug individually on high for 1 minute 15 seconds to 1 minute 30 seconds, or until the cake has risen and set but is still moist.
06 - Allow cakes to cool for 2 minutes before serving warm.