Preheat the oven to 400 degrees F and line a 12-cup muffin tin with parchment muffin liners. In a bowl combine flour, baking powder, baking soda, and sea salt, and stir together.
2¼ cup gluten free all-purpose flour, 1 tsp baking powder, 1/2 tsp baking soda, 1/2 tsp sea salt
In another large bowl, rub together sugar and lemon zest with your fingers.
Zest of 2 lemons, 1 cup sugar
Whisk in butter, eggs, yogurt, lemon juice, and vanilla extract.
1/2 cup melted butter, 2 eggs, 1/2 cup plain yogurt, 1/4 cup lemon juice, 1 tsp vanilla extract
Add dry ingredients to wet ingredients and stir until just combined.
Divide the batter into the prepared muffin tin. Sprinkle the top with more sugar, then bake for 16-18 min until a toothpick inserted in the center comes out clean.
Cool for 10 minutes then transfer to a cooling rack.
Once fully cooled, use a paring knife or a 1/2 tsp spoon to scoop out a hole in the center about 3/4 of the way down the muffin and remove the little piece.
Use a spoon or fill a piping bag with a large circular tip to fill each muffin hole with lemon curd - about 1 tbsp per muffin. Enjoy!