Preheat oven to 400°F. Mix flour, Italian seasoning, garlic salt and pepper in shallow dish. Toss beef strips with flour mixture.
Spray large nonstick skillet with no stick cooking spray. Add beef and onions; cook and stir on medium-high heat 3 minutes or until browned. Add remaining ingredients, except pie crust; mix well. Bring to boil. Pour into 9-inch deep dish pie plate or 2-quart round baking dish. Top with pie crust. Seal and flute edges. Cut several slits in top.
Bake 25 to 30 minutes or until crust is golden brown.