To a microwave safe mug (preferably 10-ounces or larger) add the diced peaches, brown sugar, and cinnamon
Place in the microwave and cook on high for 30-45 seconds, or until the peaches soften slightly (remove when they start to bubble)
Remove the mug, then add the remaining ingredients and stir until just combined (do not overmix or your cake will be tough)
Return to the microwave and cook on high for 45 seconds to 1 minute. Add additional time in 15-second increments as needed, until the center is just set. It may appear wet, but should not actually be wet to the touch
Serve immediately, with a scoop of vanilla ice cream, whipped cream, or fresh peach slices if desired
MY TWEAKS: Add ¼ c SD starter or discard, use kefir in place of milk, cut the butter to 1 tsp, and use allulose in place of brown sugar. I softened ½ diced peach in 1 T allulose and cinnamon in a small skillet. I put that in the bottom of my mug, then mixed the remaining ingredients (including extra allulose) in a 1 c measuring cup and poured them over the peaches. Microwave for 1 minute.
