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Preheat oven to 350 degrees, line a 9x13 baking dish with aluminum foil or parchment paper. Set aside.
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In a large mixing bowl, beat the butter and brown sugar together on low-speed with a paddle attachment. Using a plastic spatula, mix in the eggs, then the flour, baking powder, salt, and 2 cups of the chopped butterfingers. Make sure not to over-mix.
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Spread the batter into the baking dish, sprinkle the rest of the chopped up butterfingers on top and press lightly into the batter.
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Bake for 20-22 minutes. You want to slightly under bake them. When they are finished baking, they will be giggly, that is normal. They will finish baking in the baking.