mint chocolate triple layer cookie squares

The title is long and complicated, but it's a very simple recipe. Perfect for parties and for midnight snacks. :)

Ingredients:

[First chocolate layer]
Butter - 1 stick (1/2 cup) (softened)
Sugar - 1/2 cup
Egg - 1 large (lightly beaten) 
Vanilla - 1/2 tsp
Salt - 1/4 tsp
Cocoa powder - 1/4 cup
Flour - 3/4 cup **see TIPS

[Second white layer]
Butter - 1 stick (1/2 cup) (softened)
Sugar - 1/2 cup
Egg - 1 large (lightly beaten)
Vanilla - 1/2 tsp
Salt - 1/4 tsp
Flour - 1 cup

[Third layer]
Andes or After Eight mint chocolate - 1 pkg (7 oz) or enough to cover the top layer **see TIPS

Prep:

1. Leave butter and egg to room temperature. Butter should be softened. 
2. Measure all ingredients.
3. Grease 9-inch baking pan (or use parchment paper - still grease lightly)
4. Preheat oven to 350 F. 
5. Unwrap mint chocolates if they are individually wrapped. 

Bake:

1. [Chocolate layer] In a mixer, beat butter and sugar until smooth and creamy. Add in beaten egg and vanilla, beat on medium speed for couple of minutes. Add salt, cocoa powder, and flour. Mix until it forms a dough. 
2. Press chocolate layer on a greased baking pan.
3. [Second layer] In a mixer, beat butter and sugar until smooth and creamy. Add in beaten egg and vanilla, beat on medium speed for couple of minutes. Add salt and flour. Mix until it forms a dough.
4. Press careful/lightly on chocolate layer. It's easier to spread the dough in your hand before placing them in the pan.
5. Bake for 18-20 minutes in preheated 350F oven or until the top is golden brown.
6. Place mint chocolate on top. It should cover most of the surface, but you can adjust more or less, depending on how much minty chocolate you want. Bake for 2 more minutes.
7. Using spatula, spread the melted chocolate to create marbled look. 
8. Cool completely. 

Serve:

1. Cut them into 16 squares or 25 squares or in any shape you want. 
2. Keep in airtight container for storage. 

TIPS

• If you live in humid places, add 1/4 cup more flour so it won't be too gooey. 
• Not a mint chocolate fan? You can use other chocolate flavors as well.