I have made this cake many times – it is one of my favorites!
1 Preheat oven to 325 degrees F (165 degrees C). Grease and flour a 10 inch tube pan. Mix together the flour, baking powder and salt. Set aside.
2 In a large bowl, cream together 1/2 cup butter and 2 cups brown sugar until light and fluffy. Beat in the eggs one at a time, then stir in the maple flavoring. Beat in the flour mixture alternately with the evaporated milk, mixing just until incorporated. Pour batter into prepared pan.
3 Bake in the preheated oven for 70 to 80 minutes, or until a toothpick inserted into the center of the cake comes out clean. Let cool in pan for 10 minutes, then turn out onto a wire rack and cool completely. Decorate with Brown Sugar Frosting.
4 To make Brown Sugar Frosting: In a medium saucepan, combine 1/4 cup butter, 1/2 cup brown sugar, the confectioners’ sugar, milk and vanilla. Cook over low heat, beating until sugar is dissolved and mixture is smooth.