If making in the slow cooker, follow steps 1 and 2 (optional). Then, heat a no-stick skillet over medium heat. Add oil and sauté the onion and the apple for about 3 minutes, stirring every once in a while. Add them to the crockpot as well as the (roasted) squash, pumpkin purée, cinnamon, curry, and broth. Stir to combine. Cover and set to high for 3-4 hours. Then follow step 4.