Pineapple-Crumb Bars

This came from one of those Bake Sale Cookbooks and it's simple to make and turned out pretty good, although I think they could use "a little something" to perk them up. Suggestions, all?

• Ready In: 50 mins
• Serves: 24

Ingredients

• 1 (18 ounce) box  yellow cake mix
• 1⁄2 cup butter, softened, divided
• 1 1⁄2 cups quick oats, divided
• 1  large egg
• 1 (20 ounce) can  pineapple pie filling
• 1⁄3 cup brown sugar, packed

Directions

1. Preheat oven to 350. With mixer or pastry blender, beat cake mix, 5 tablespoons of the butter, and 1 cup of the oats. Mix until crumbly and then set aside 1 cup of this mixture for the topping.
2. Combine egg and the remaining mixture and stir well. Press into 9 x 13" pan that has been greased and floured. Spread the pineapple pie filling evenly over the crust.
3. In the same bowl, combine the reserved crumb mixture, the remaining oats, 3 tablespoons butter and the brown sugar and blend well. Sprinkle over the pineapple filling and bake for about 35 minutes or until light brown on top.