Heat vegetable oil in a large cauldron or a heavy-bottomed saucepan over medium heat.
Add pumpkin, poblano, oregano, cumin, garlic and 0.5 teaspoon. salt and sauté, stirring frequently, until the pepper is softer, about 5 minutes. Add 5 tablespoon. water, tomato puree and 0.5 teaspoon. salt, cover and bring to a boil. Remove the lid and cook until the squash is tender, about 15 minutes, adding the corn 2 minutes until tender.
Season with salt to taste and pour into bowls. Top with avocado and salsa, sprinkle with oregano. Serve with chips.