Preheat the oven to 350 F. In a medium bowl, whisk together flour, salt, and baking soda. In a large bowl, combine butter with peanut butter and sugar until fluffy. Add in the vanilla extract and egg and mix until smooth.
Add in the flour mixture, mix until it is fully combined. Fold in the mini cadbury eggs. In a shallow dish, combine granulated sugar and ground cinnamon.
Roll the cookie dough into balls, then roll each one into the cinnamon sugar mixture. Place the cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.
