Line an 8x8 baking dish with foil, leaving a 1 inch overhang. Spray with non-stick cooking spray.
To prepare the cookie dough, beat together the butter and sugar until light and fluffy, about 3 minutes.
Beat in the vanilla, salt, and half and half.
Stir in the flour until incorporated. Set aside.
To make the fudge base, combine the brown sugar, butter, salt, and half and half in a saucepan. Stir over medium low heat until the butter has melted and the brown sugar is dissolved.
Remove from the heat and slowly stir in the powdered sugar, 1 cup at a time, until the mixture is smooth and well combined. Stir in the vanilla.
Add the cookie dough to the fudge base and stir to combine. Mix in the chocolate chips.
Spread the mixture in the prepared baking dish. Chill until set, at least 3 hours. Keep in refrigerator for up to 1 week.
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Notes
If you're concerned about the raw flour, you may spread it on a baking sheet and bake it in at 300 degrees for 10 minutes or until it reaches 160 degrees. Let cool before using.You'll notice the recipe calls for 4-5 cups of powdered sugar. 4 cups of powdered sugar will yield a less sweet fudge that is very soft and needs to be served cold. 5 cups of powdered sugar will result in a sweeter fudge that is more firm and can hold it's shape better out of the fridge.A reader has successfully made this recipe with gluten free flour, if you'd like to try a gluten free version!