Mix cinnamon and sugar in a small bowl and set aside.
In a large bowl, mix together flour, baking soda, and salt. Set aside.
With a hand whisk, cream butter, bacon fat, and sugar. When fully combined, add egg one at a time and blend until fully mixed. Add peanut butter and vanilla, and mix until incorporated.
Add wet ingredients to dry ingredients and mix until just combined.
Scoop 1 tablespoon of dough at a time and shape into balls. Roll cookie balls in the cinnamon-sugar mixture. Place 2 inches apart on a parchment-lined baking sheet.
Bake for 8-10 minutes, until golden brown. Let cool.