Preheat oven to 350°.
Combine 1/2 cup granulated sugar, cereal, espresso granules, and cinnamon in a small bowl; stir with a whisk. Set aside.
Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, remaining 1 cup granulated sugar, baking soda, baking powder, and salt in a large bowl. Add yogurt, butter, and egg substitute; beat with an electric mixer on low speed 1 minute or until combined. Spread half of batter into an 8-inch square baking dish coated with cooking spray. Sprinkle with cereal mixture; top with remaining half of batter. Bake at 350° for 45 minutes or until a wooden pick inserted in center comes out clean; cool in pan.
Combine powdered sugar and coffee in a small bowl; spread glaze evenly over top of cake. Cut into 12 pieces.