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1
For the crust/topping:
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2
Preheat the oven to 350 F. Grease a 9x9 inch baking pan and set it aside.
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3
Combine the flour, sugar, and salt in a medium bowl. Cut the butter into 1/2-inch cubes and add it into the flour mixture. Using a fork or pastry cutter, cut the butter into the dry ingredients until the mixture resembles coarse crumbs. Reserve 3/4 cup of the mixture to use as the topping, setting it aside for now. Press the remaining mixture into the bottom of the prepared pan, and bake for 10-12 minutes, or until light golden brown. When done remove it from the oven and allow it to cool for 10-15 minutes.
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4
For filling:
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5
Whisk the eggs in a large bowl, then add the white and brown sugar, sour cream, flour, salt and vanilla extract. Mix to combine.
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6
In a small bowl toss the chocolate chips with the tablespoon of flour. This helps prevent the chips from sinking to the bottom.
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7
Gently fold the chocolate chips into the batter and pour the mixture over the crust. Scatter the remaining flour mixture evenly over the filling, and bake 35-45 minutes, until top is golden and a toothpick inserted in the middle comes out clean.
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8
Cool for 1 hour before cutting into bars.
