Fresh Apple Streusel Pecan Cake

1/3 cup packed brown sugar

1 cup pecans, coarsely chopped

3 tablespoons canola or vegetable oil

1 cup granulated sugar

1 container (6 oz) Yoplait® Greek Fat Free honey vanilla yogurt

2/3 cup canola oil

1 teaspoon vanilla

2 eggs

1 1/2 cups Gold Medal® all-purpose flour

1 1/2 cups Gold Medal® whole wheat flour

3 teaspoons baking powder

1/2 teaspoon ground cinnamon

1/2 teaspoon salt

2 cups finely chopped, peeled apples (2 medium)