Lemon Coconut Blondies

For the blondies:
• 1 cup sugar
• 1/2 cup (1 stick) butter
• 2 eggs
• 1 teaspoon vanilla extract
• 3 tablespoons lemon juice and 1 teaspoon lemon zest from about 1 lemon
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 2 cups flour 
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