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Preheat oven to 325 degrees. Spray a 9x13 inch baking dish with nonstick cooking spray.
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In in a bowl combine flour, sugar, baking powder, and salt.
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In the bowl of your mixer, beat 8 tablespoons melted butter, eggs, buttermilk and vanilla extract until combined.
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Stir in flour mixture.
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Pour batter into baking dish.
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To make the topping, combine the flour, 1 cup melted butter, brown sugar, and cinnamon. Mix until small clumps form.
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Sprinkle topping over the batter.
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Bake for 45-50 minutes or until a knife is inserted and comes out clean.