Mix together flour, ¼ cup sugar and brown sugar in a small bowl. Cut in butter until crumbly. Stir in oats and pecans. Reserve one cup for topping.
Press the remaining crumb mixture into the bottom of the baking pan and bake for 15 minutes.
While the crust bakes, beat cream cheese, spices and remaining sugar in a small bowl until smooth. Add eggs and beat on low speed until just blended. Pour filling over warm crust and sprinkle with the reserved crumb mixture.
Bake the bars for 20-25 minutes, or until a knife inserted near the center comes out clean and the filling is set. Cool on a wire rack. Serve or refrigerate, covered, within 2 hours of baking.
Notes
What I'd Do Different Next Time
From a process point, I'd definitely use a medium bowl for small and a large bowl for medium. I'd also make time and a half the amount of crumb mixture so I'd have more for the topping than just a cup.