1. Heat oil in a large saucepan over medium heat. Saute onion and red pepper until almost tender (5-6 minutes).
2. Add the corn, jalapeños, garlic, and chili powder. Saute until corn is just browning (2-3 minutes).
3. Stir in the broth, pumpkin, salt, and cayenne pepper. Bring to a boil. Reduce heat to low, cover, and simmer to combine flavors (10-15 minutes).
4. Stir in lime juice to serve.