How to Make It
Heat a Dutch oven over medium-high heat. Add 1 tablespoon oil; swirl to coat. Add onion; sauté 3 minutes. Add corn, salt, and pepper; sauté 3 minutes. Add 2 cups water; bring to a boil. Reduce heat; simmer 6 minutes. Place corn mixture and half-and-half in a blender. Remove center piece of blender lid (to allow steam to escape); secure blender lid on blender. Place a towel over opening in blender lid (to avoid splatters). Blend until smooth.
Place peas in a small bowl; mash slightly with a fork. Stir in remaining 1 tablespoon oil, basil, and crab; serve over soup.