Preheat oven to 350 F. Coat 9-inch pie plate with nonstick cooking spray. Unfold pie crust on flat surface, pressing out fold lines with fingers. Place crust in pie plate, crimping edge as desired; set aside.
Heat large skillet over medium heat until hot. Add ground beef and seasoning mix; cook 4-5 minutes, breaking into small crumbles, stirring occasionally. Pour off drippings, as necessary.
Add spinach, asparagus, onion and bell pepper to skillet; cook 3-5 minutes, or until softened. Cool slightly.
In large mixing bowl, whisk eggs and cream. Gently stir in beef mixture. Pour into prepared pie crust; sprinkle with cheese. Bake 40-45 minutes, or until egg mixture is set and just beginning to brown. Cool 5-10 minutes; cut into wedges.