For streusel topping: Combine flour, sugar and cinnamon in small bowl. add butter; mix until crumbly. For batter: Combine flour, sugar, baking powder and salt in large bowl. In small bowl, whisk egg, milk and oil. Add to dry ingredients; stir until just moistened. Gently stir in blueberries and peel. Pour batter into greased 9 inch square baking pan; sprinkle with streusel.
Bake at 375 degrees F for 30-35 minutes or until wooden pick inserted in center comes out clean.
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