Heat oven to 350. Line a baking sheet with
parchment paper and set aside
Cream butter and sugar in mixing bowl until light
and fluffy. Add egg and vanilla and mix until
fluffy. In a small mixing bowl combine cake flour,
cornstarch, baking powder, baking soda and salt.
add to butter mixture and mix by hand until dough
forms. Place in bowl, cover and refrigerate while
making streusel
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