HEAT oven to 350°F. Coat 8-inch square pan with baking spray with flour.
COMBINE quick bread mix, brown sugar and 1/2 cup oats in large bowl. Add apple filling packet, water, sour cream, eggs and vanilla. Stir 50 to 75 strokes until well blended. Pour into pan. Combine streusel topping packet, 1/3 cup oats, pecans and butter in small bowl with fork until blended. Crumble over batter in pan.
BAKE 40 to 45 minutes or until topping is golden brown and cake springs back when touched lightly in center. Cool slightly before serving.
TIP **HIGH ALTITUDE (above 3500 feet): Add 2 tablespoons flour to dry mix. Bake as directed.