Combine brown sugar, cinnamon, lemon rind and juice in a large bowl. Add peaches; toss to mix. Transfer to prepared baking dish. 2>. Combine flours and baking powder on a piece of waxed paper. Beat together butter and sugar in a medium-sized bowl until light and fluffy. Beat in egg white. Add dry ingredients alternately with milk and vanilla, stirring just to combine. Drop batter by spoonfuls over peach mixture; Spread gently. 3>. Bake in preheated 375 degF. oven for 25 to 30 minutes or until peaches are tender and crust is golden brown. Serve warm.