PREHEAT oven to 350° F. Grease 13 x 9 x-inch baking pan. For the streusel topping, combine brown sugar, cinnamon and nutmeg in medium bowl. Cut in 1/3 cup butter with pastry blender or two knives until mixture is crumbly; stir in semi-sweet morsels, milk chocolate morsels, oats and pecans; set aside.
COMBINE flour, baking powder, baking soda and salt in medium bowl.
COMBINE sour cream, cherries, orange peel and orange juice in small bowl.
BEAT 3/4 cup butter and granulated sugar in large mixer bowl on medium speed for 4 minutes. Add eggs, one at a time, beating well after each addition. Beat in vanilla extract until just combined. Alternately add the flour mixture and sour cream mixture, beating until just combined after each addition. Spread batter into prepared pan.
BAKE for 20 minutes. Sprinkle top evenly with streusel topping and bake an additional 15 to 20 minutes more or until a wooden toothpick inserted near the center comes out clean. Let cool on wire rack. Serve warm or cool completely.