Sour Cream Coffee Cake
["1/3 cup light brown sugar (packed)", "2 Tbsp. sugar", "1 1/2 tsp. cinnamon", "1/2 cup cake flour", "4 Tbsp. unsalted butter", "1/2 tsp. vanilla"]
["Combine all ingredients and mix with fingers until it is crumbly. Set aside."]
["light brown sugar", "sugar", "cinnamon", "cake flour", "unsalted butter", "vanilla"]