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Line the baking pan with aluminum foil, then spritz the pan with cooking spray.
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Stir the brown sugar and butter in a bowl with a hand mixer until puffed, then add the flour and salt and stir until crumbled.
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Pour the mixture in the prepared baking pan and tilt the pan to coat the bottom evenly.
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Slide the baking pan into Rack Position 1, select Convection Bake, set temperature to 350ºF (180ºC) and set time to 13 minutes.
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When done, the crust will be golden brown.
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Meanwhile, pour the milk, butter, sugar, and maple syrup in a saucepan. Stir to mix well. Bring to a simmer, then cook for 1 more minute. Stir constantly.
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Turn off the heat and mix the pecans and vanilla into the filling mixture.
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Pour the filling mixture over the golden crust and spread with a spatula to coat the crust evenly.
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Select Bake and set time to 12 minutes. When cooked, the filling mixture should be set and frothy.
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Remove the baking pan from the oven and sprinkle with salt. Allow to sit for 10 minutes or until cooled.
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Transfer the pan to the refrigerator to chill for at least 2 hours, then remove the aluminum foil and slice to serve.