Whip butter in a stand mixer or with a hand mixer and slowly add in sugar and continue to whip until light and fluffy. Add salt and vanilla. Slowly add in 3 cups of the flour and then add in the mix ins. Then add in the last 2 cups flour. The dough should all come together into a ball. Press onto a parchment lined baking sheet (a quarter sheet pan is the perfect size) and prick all over with a fork. Chill until firm.

Preheat oven to 350 F.

Sprinkle chilled dough with cinnamon and sugar. Bake until just starting to brown around the edges, about 20-25 minutes. Let cool completely and cut into squares.