In large mixing bowl, whisk together cake mix, brown sugar and cinnamon.
Add melted butter and eggs; beat on medium speed for 2 minutes.
Stir in apple, dates and pecans.
Spread evenly in prepared pan. Bake for 30-35 minutes, or just until golden brown. Cool completely on a wire rack before cutting.
Notes
COOK'S TIPS:
Use your fingers to break up any large chunks of brown sugar when combining the dry ingredients, but don't worry about any smaller clumps.
Pull the bars out of the oven when they're just golden brown. They should still be a little soft in the middle, since they will firm up a bit as they cool. This yields a chewy, gooey date bar!
Eat them like blondies with your fingers, or garnish the bars with whipped cream or vanilla ice cream for an even more decadent treat!
This easy date bar recipe freezes really well when wrapped tightly, so they're a great make-ahead option.