Lemon Blueberry Cake with Cream Cheese Icing

box white cake mix ((I used Betty Crocker))

eggs ((at room temperature))

oil

full fat yogurt

buttermilk ((see notes for homemade buttermilk))

lemon juice ((freshly squeezed))

blueberries ((I used fresh, but frozen can be used too))

cream cheese ((softened))

butter ((softened))

powdered sugar

lemon juice ((freshly squeezed))