Lemon blueberry coffee cake with crumb topping - chinese grandma

Ingredients

• 2 cups flour
• 1 cup sugar
• 1/2 cup brown sugar, firmly packed
• Zest from 1 lemon (2-3 teaspoons)
• 3/4 teaspoon cinnamon
• 1/2 teaspoon salt
• 1/2 cup vegetable oil
• 2 tablespoons fresh lemon juice
• 1 cup plain yogurt or sour cream
• 1 large egg
• 1 teaspoon vanilla
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1 cup blueberries (fresh or frozen)
• Powdered sugar for dusting (optional)