Prep the Oven & Pan: Preheat the oven to 350℉ and generously grease a square baking pan (around 8"x8") with non-stick spray.

Mix Wet Ingredients: Melt the butter in the microwave, then add it to a large mixing bowl. Mix the melted butter with the eggs using an electric mixer until fully combined.

Add the Cake Mix: Add the dry yellow cake mix directly into the wet ingredients and mix again until a thick dough forms.

Fold in Chocolate: Add the semi-sweet chocolate chips (oh yes, the whole bag!) and use a spatula to fold and mix all the ingredients together evenly.

Press into Pan: Press the thick cookie dough firmly and evenly into your prepared baking dish.

Bake: Bake on the center rack for 20-25 minutes, or until the top is beautifully golden brown.

Cool & Slice: Let the bars cool completely in the pan before cutting them into squares. The longer they cool, the better they will hold their shape!

Serve: Serve your thick cookie bars with a cold cup of milk or a giant scoop of ice cream!