Salted Bourbon Butterscotch Cupcakes

INGREDIENTS

1/2 cup

whole milk, at room temperature

large egg plus 1 large egg white, at room temperature

1 tsp

vanilla extract

2 tbsp

bourbon

1/4 tsp

extra strong butterscotch flavoring, such as LorAnn butterscotch flavoring oil (optional)

1 1/4

cups all-purpose flour

2 tbsp

cornstarch

1 1/2 tsp

baking powder

1/2 tsp

salt

2/3 cup

dark brown sugar

6 tbsp

(3/4 stick, 85 grams) unsalted butter, at room temperature and cut into 6 pieces

large egg whites (4 ounces or 113 grams)

1/2 cup

dark brown sugar

1/2 tsp

kosher salt or flaky sea salt

3 sticks

unsalted butter, at room temperature and cut into chunks

1/2 cup

Salted Bourbon Butterscotch Sauce

Fleur de del for sprinkling