Heat oven to 350°F. In large saucepan, cook noodles to desired doneness as directed on package, adding peas during last minute of cooking time. Drain; return to saucepan.
Stir in Alfredo sauce, milk and dill; mix well. Gently stir in salmon. Pour into ungreased 1 1/2-quart casserole.
In small bowl, combine topping ingredients; mix well. Sprinkle over top.
Bake 20 to 25 minutes or until casserole is bubbly and thoroughly heated.