Streusel

•1 1/2 cups (packed) golden brown sugar
•1 tablespoon ground cinnamon
•6 tablespoons 3/4 stick) chilled salted butter, diced
•1 1/2 cups coarsely chopped pecans
•1 cup (6 ounces) semisweet chocolate chips

Cake

•3 cups all purpose flour
•1 1/2 teaspoons baking soda
•1 1/2 teaspoons baking powder
•1 1/3 cups sugar
•3/4 cup( 1 1/2 sticks) salted butter, room temperature
•3 large eggs
•1 1/2 teaspoons grated orange peel
•1 1/2 teaspoons vanilla extract
•1 1/2 cups sour cream
•1/4 cup orange juice
•
•Powdered sugar