Melt 1 tbl butter in a large, heavy skillet over medium heat. Add garlic, chopped sweet peppers and onions. Cook 3-5 minutes, stirring frequently. Stir in flour, cooking 4 more minutes, then gradually add whipping cream. Cook until thickened, stirring constantly.
Stir in crabmeat, 1/4 cup of the bread crumbs, egg, mustard, lemon juice and peel, salt and pepper. Mix well, remove from heat. Cover and refrigerate for 4 hours.
When mixture has chilled, shape into 2" patties. Coat with remaining bread crumbs. Melt 2 tbl butter in large skillet. Cook crabcakes over medium heat until golden.