1. Preheat oven to 350 degrees. Line a 13x9 inch baking pan with foil, letting excess extend over sides of pan; spray foil with cooking spray.

2. In a large bowl, stir together 2 cups flour, oats, brown sugar, pecans (if using), salt, pie spice, and baking soda. Add butter, and beat with a mixer until mixture is crumbly. Reserve 1 1/2 cups oat mixture in a small bowl; press remaining oat mixture into bottom of prepared pan.

3. Bake until set and just barely golden, about 15 minutes.

4. Meanwhile in the same large bowl, beat cream cheese, granulated sugar, cream or milk, and remaining 1 tablespoon flour with a mixer at medium speed until craemy, 2-3 minutes, stopping occasionally to scrape sides of bowl. Add eggs, one and a time, beating well after each addition. Pour mixture onto prepared crust and spoon pumpkin butter by tablespoonfuls onto cream cheese mixture. using a knife, swirl mixtures together. Sprinkle reserved oat mixture on top.

Bake until top is golden brown, 30-35 minutes. Let cool completely in pan on wire rack. Using excess foil as handles, remove from pan before cutting into bars. Cover and refrigerate for up to 3 days.