1 cup butter, room temperature
1 cup brown sugar
1 T instant coffee or espresso powder
1 tsp vanilla
2-1/4 cup flour
1/2 tsp baking powder
1/2 tsp salt
2 cups semisweet chocolate chips
2 T milk
1 T butter
3/4 cup powdered sugar
1/4 tsp cinnamon
Preheat oven to 375 with rack in the middle. Line a rimmed 10'x15' pan with parchment paper or lightly grease the pan. Cream the first 4 ingredients. Blend in the flour, baking powder and salt. Stir in the chocolate chips by hand. Press and flatten the dough evenly into the pan. Bake 5 minutes, rotate the pan, bake 5-10 more until the edges start to brown. Cool 5 minutes before glazing.
Mix the glaze ingredients in a small sauce pan on medium heat until smooth and barely bubbly.
Drizzle it over the pan, smoothing out the edges. Cool until just warm to touch. Cut 6 on the 10" side, 4 on the 15" side, then cut each piece diagonally.
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