INGREDIENTS
1
package yellow cake mix (mix only, not prepared)
1
egg
1 cup
sour cream (may sub plain greek yogurt)
1/4 cup
butter, melted
1 tsp
vanilla
1 1/4 cups
flour
2/3 cup
brown sugar
1/2 cup
sugar
1/2 tsp
salt
1 tsp
cinnamon
1/2 cup
butter (8 tablespoons), chilled and cut into cubes