Place oil in a large pot over medium-high heat and add onion. Stir constantly for about 2 minutes, until beginning to soften. Add bell peppers, stirring for about 2 minutes. Add squash, greens, and garlic, and stir for 2 minutes. Add bouillon cubes, chopped chipotle, paprika (if using), corn, and 2 cups boiling water, stirring well.