Set oven to 350°F
Combine dry ingredients in a medium bowl and set aside
Cream together all wet ingredients in a stand mixer until well combined
Add dry ingredients to wet and mix until batter is just combined
Spread batter evenly among 12 muffin tins
Bake for 20-30 minutes checking with a toothpick for readiness
Combine lemon juice, sugar, butter, eggs, and lemon zest in a 2-quart saucepan
Cook over medium-low heat, whisking constantly until mixture thickens and bubbles rise to the surface, about 5 to 6 minutes
Remove saucepan from heat and transfer lemon curd into a large bowl
Once cooled, cut little divots into the muffins, dust with powdered sugar and add lemon curd to center