In a small to medium microwavable bowl, add 2 tablespoons (25g) chocolate chips, nut butter, and butter. Microwave in 20 second intervals until just melted, stirring after each time.
If you let it get very hot, let it cool off for a minute or two (we don’t want to cook the egg). Then whisk in the coconut sugar, egg, baking powder, and salt until smooth.
Stir in the remaining 1 tablespoon chocolate chips. Microwave for 30-40 seconds (30 is the sweet spot for me) or until it’s mostly cooked through on the edges but with a good amount of gooey-ness in the center.
Top with flaky salt and eat immediately!