Combine butter and white baking pieces. Heat just until melted. Remove. Dissolve coffee granules in 1 tablespoon of water. Stir into melted mixture with sugar, vanilla, and eggs. Combine flour, baking powder and salt. Add to mixture. Stir in raisins. Spread in a greased 13x9 inch pan. Bake 30 minutes at 350 degrees or until set in middle. Cool. Drizzle with glaze. Makes 36 bars.
Glaze: Combine 1/4 teaspoon instant coffee granules and 4 teaspoons water. Stir to dissolve. Add 1 tablespoon melted butter. Mix in 3/4 cups of sifted powdered sugar.
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