In a large bowl, combine the flour, 1 cup sugar, baking powder, salt and baking soda. Cut in shortening until mixture resembles coarse crumbs. In a small bowl, whisk the egg yolks, 2 egg whites, milk and vanilla; gradually add to crumb mixture, tossing with a fork until dough forms a ball. Divide in half, making one portion slightly larger. Roll out larger portion of dough between two large sheets of waxed paper into a 17x12 inch rectangle.
Transfer to an ungreased 15x10 inch baking pan. Press pastry onto the bottom and up the sides of pan; trim pastry even with top edges. Spread apricot filling over dough; sprinkle with walnuts. Roll out remaining pastry to fit top of pan; place over filling. Trim, seal and flute edges. Cut slits in top.
Whisk remaining egg white; brush over pastry. Sprinkle with remaining sugar. Bake at 350 degrees F for 35-40 minutes or until golden brown. Cool on a wire rack.
By Robin from Washington, IA
Source: Taste of Home
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