Line an 8x8-inch baking pan with parchment paper, leaving some extra running up and out of the sides of the pan to act as handles. Set it aside.
In a dutch oven, or medium pot over medium-low heat, pour in the sweetened condensed milk and white chocolate chips. Slowly stir, but consistently, until the milk and chocolate chips have melted and have created a smooth mixture.
Remove from the heat. Add blue gel food color and stir until it's all the same desired shade of blue.
Carefully fold in 1/2 cup of mini Oreos and 1/2 cup of mini Chips Ahoy cookies. Note: the mixture is going to start setting up quickly so work fast here but not so fast that you are making the cookies fall apart.
Pour the mixture into the parchment lined dish, use a spatula or the back of a spoon to spread the mixture into an even layer.
Add remaining Oreos and Chips Ahoy onto the surface of the fudge. Place pairs of candy eyes around the surface of the fudge as well.
Place the fudge mixture into the fridge for 90 minutes to set. Remove from the pan and cut with a sharp knife into 16 pieces. Serve and enjoy.
Notes
Make sure not to go above medium-low heat when stirring the condensed milk and chocolate otherwise you risk burning it.
Stir the fudge mixture slowly but consistently so as not to introduce too much air to the mixture to create air bubbles.
Keep your fudge in an airtight container for up to 2 weeks. If you find that your room gets warm, keep it in the fridge so it doesn't start to melt.
You can freeze this cookie fudge by wrapping it in plastic and then placing it in a freezer safe container for up to 3 months.
Don't take too long to stir the cookies in. The fudge will start to set once it's off the heat so it'll thicken up fast.
When placing the candy eyes, put them on about every 2 inches so each fudge piece has a set of eyes.
You can use other cookies, just make sure they're small enough.
If you need to use full size cookies, you can, just cut them into quarters.
Feel free to use the blue candy melts instead of white chocolate.
Use a long bladed, shape knife to get clean cuts for your fudge. See more tips above in the frequently asked questions section on how to get beautifully cut pieces of fudge.