Preheat oven to 350°F (180⁰C). Grease 8-inch (20 cm) square metal baking pan with nonstick cooking spray or oil.
In a large bowl, using an electric mixer on low speed, combine butter, flour, icing sugar and salt. (Mixture will appear crumbly but should hold together when pressed with your fingertips.) Press evenly into bottom of prepared pan. Bake for 15 to 20 minutes or until edges are lightly brown. Remove from oven; cool on wire rack for 5 minutes.
Filling: Meanwhile, in a large, clean bowl, using an electric mixer on medium speed, beat eggs, brown sugar, maple syrup, butter, flour, vinegar and vanilla until smooth. Pour mixture over cooled base. Bake for 35 minutes or until mixture bubbles and is set in the middle.
Cool completely in pan on wire rack. Cut into squares.
In partnership with Ontario Maple.
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