How to Make It
Steam broccoli, covered, 2 minutes or until tender.
Place a Dutch oven coated with cooking spray over medium heat until hot. Add onion; sauté 4 minutes. Add potato and next 8 ingredients (potato through broth); bring to a boil. Reduce heat; simmer, uncovered, 30 minutes or until tender.
Place 3 cups potato mixture in a blender; process until smooth. Add puree back to potato mixture in pan; stir well.
Place flour in a bowl. Gradually add milk; stir with a whisk until blended. Add to potato mixture. Cook over medium heat until thick (about 10 minutes), stirring constantly. Stir in cheese. Add broccoli, crabmeat, lemon juice, and sherry; cook until thoroughly heated.