White Chocolate Cardamom Blondies with Grapefruit Frosting (Gluten-Free)

INGREDIENTS

1/2 tsp

Grapefruit, zest

Egg, large

1/2 tsp

Baking soda

1/2 cup

Brown sugar, packed dark

1/4 cup

Cane sugar, organic

3/4 tsp

Cardamom, ground

1/4 cup

Gluten-free oat flour

5/16 cup

Millet flour

3/4 cup

Powdered sugar

1/2 tsp

Salt

1 pinch

Salt

3/8 cup

Sweet rice flour

2 1/2 tsp

Vanilla

4 oz

White chocolate, good-quality

1/2 cup

Grapefruit juice, freshly squeezed

3/4 cup

Butter, unsalted

4 oz

Cream cheese