Preheat oven to 350°F (180°C). Line a 9×13-inch (3 L) pan with parchment paper and brush with oil to coat; set aside.
Whisk pumpkin pie filling with brown sugar, eggs, oil and vanilla until blended. Stir in oats; let stand for 5 minutes. In a separate bowl, stir all-purpose flour with whole-wheat flour, baking soda and salt until combined.
Stir the wet mixture into the dry mixture until just combined. Fold in cranberries, apricots, pecans and pumpkin seeds. Scrape into prepared pan. Smooth the top.
Bake for 30 to 35 minutes or until a tester inserted into center of bars comes out clean and edges are golden. Cool completely. Remove from pan and peel off parchment. Transfer to cutting board to portion into bars.
Substitute your favourite nuts, seeds and dried fruits like raisins, dates, walnuts, almonds or sunflower seeds.
Store the bars, tightly covered, at room temperature for up to 1 week.