Dark Chocolate Orange Shortbread

INGREDIENTS

2 cups

all-purpose flour

2/3 cup

unsweetened cocoa powder

1/2 tsp

salt

1/2 cup

+ 2 tablespoons sugar

Zest of 1 large orange

2 sticks

unsalted butter (softened)

1 tsp

vanilla

1/8 tsp

orange extract {I used the juice of 1/4 orange}

Decorative sanding sugar (optional)