1Heat oven to 400°F. Grease pie plate, 9x1 1/4 inches. Mix crabmeat, cheeses, onions and pimientos in pie plate.
2Stir remaining ingredients in bowl with fork until blended. Pour into pie plate.
3Bake uncovered 35 to 40 minutes or until golden brown and knife inserted in center comes out clean (some cream cheese may stick to knife). Let stand 10 minutes before cutting.