Preheat the oven to 350°F. Line two large baking sheets with parchment paper and set aside. Chop up 3-4 of the Oreos and the mini chocolate chip cookies, then set aside. (Leave 10 of the Oreos whole to stuff in the cookies).

In the bowl of a handheld mixer or standing mixer with the paddle attachment, beat the butter and sugars together until light and fluffy (about 1-2 minutes). Mix in the egg, food coloring, and vanilla extract.

Add in the flour, salt, and baking soda, and mix until just combined (don't over-mix). Fold in the chocolate chips, chopped Oreos, and chopped mini chocolate chip cookies.

Scoop 10 heaping tablespoons of dough onto each baking sheet. They should be fairly big. Press a whole Oreo cookie slightly into half the balls of dough, then top with another heaping tablespoon of dough to cover the Oreo completely. Bake 5 assembled cookies on each baking sheet.

Bake the cookies one tray at a time in the preheated oven for 8-10 minutes, until edges and top look set. Let cool on the baking sheet for 10 minutes, then transfer to a cooling rack to finish cooling.