Oreo crunch

Mix the melted butter and Oreo chunks together, making sure all of the pieces are evenly coated in butter.

Place on a greased baking sheet and bake in the oven at 400 for about 6-8 minutes. They will still feel a bit soft but will harden up as they cool.

Cookies

Mix together white sugar and cinnamon in a small bowl until well combined and set aside (you will use this to roll your dough in before baking)

In a large bowl, whisk together flour, cream of tartar, baking soda, and salt in a separate bowl

Stir in the flour mixture until a dough starts to form - don't overmix

Form dough into 2-3 inch balls, and then roll in the cinnamon-sugar coating. Place dough balls about 2 inches apart onto the prepared baking sheet either greased or lined with parchment paper.

Using your thumb, gently press a small dent into the top of each cookie and fill it with the Oreo crunch topping. Don't press too hard or the dough will crack.

Bake in the preheated oven on the center rack at 350 for about 10-11 minutes minutes. Remove from the oven when they still look a bit undercooked in the middle, as they will continue cooking on the baking sheet. Allow cookies to cool for about 10 minutes before transferring to a wire rack to cool completely.