Preheat the oven to 300°F and lightly spray a 13x9-inch baking dish with nonstick cooking spray. Melt butter, add sugars, and blend well by hand. Add beaten eggs, stir well. Add flour and stir until all lumps are gone. Add pecans and vanilla. Pour into the prepared baking dish.
Bake approximately 40 to 50 minutes being cautious not to over cook. They will still be jiggly in the middle.
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