Walnut Orange Coffee Cake

Ingredients

• 1 cup quick-cooking oats
• 1-1/2 cups orange juice
• 1/2 cup butter, softened
• 1-1/2 cups sugar
• 1/2 cup packed brown sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• 1-3/4 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1/4 teaspoon ground cinnamon
• 1/2 cup chopped walnuts
• 1 tablespoon grated orange zest
• 1-1/2 cups packed brown sugar
• 3/4 cup butter, cubed
• 3 tablespoons grated orange zest
• 3 tablespoons orange juice
• 3 cups sweetened shredded coconut
• 1-1/2 cups chopped walnuts