Place graham crackers in a food processor and pulse until they are in crumbs. Transfer to a large bowl.
Add sweetened condensed milk and vanilla and stir to combine.
Stir in chocolate chips. The batter will be very thick.
Pour into a greased 9x13 glass baking pan, use your spoon to smooth them into an even layer, and bake at 350 for 35 minutes.
Let cool completely in the pan then cut into small squares.
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Notes
You can easily halve the recipe and make a smaller batch of these brownies in an 8x8 glass pan. Check after 30 minutes, but the cooking time is nearly the same.