Preheat the oven to 350°F and spray two 24‑count mini muffin pans with baker’s joy.
n a medium bowl, whisk together 1.5 cups all-purpose flour, 1/2 tsp baking soda, and 1/4 tsp salt.
In a large mixing bowl, beat 1 cup sugar with 1/2 cup softened butter until light and fluffy, about 3 minutes.
Add the 2 eggs and 1 extra egg yolk, one at a time, mixing well after each addition. Mix in 1 tsp vanilla extract.
In a small bowl, whisk together 1/2 cup half and half, 3 Tbsps fresh lemon juice, 2 tsps fresh lemon zest. and 2 Tbsps sour cream.
Mix the milk mixture in to the butter mixture until nice and creamy. Stir in the dry ingredients until just combined.
Scoop the batter into the pans, filling each cup about 2/3 full
Bake for 9–10 minutes, or until lightly golden and a toothpick comes out clean.
Cool in the pan for 5 minutes, then turn the cakes out onto a cooling rack bottom‑side up to cool completely.
Make the Lemon Glaze
Whisk together 1.5 cups powdered sugar, 1 tsp lemon zest, 2 Tbsp melted butter, 2 Tbsps of half and half, and 3-4 Tbsp lemon juice until completely smooth.
Dip each cooled cake into the glaze, coating the bottom and sides. Let excess drip off, then place the cakes back on the rack bottom‑side up to set.