Make pie dough according to instructions. Roll out and place in a greased 9-inch deep pie plate. Set aside.
Preheat oven to 350°F.
Heat oil in a large skillet over medium-high heat. Sauté garlic, peppers, spinach and green onions together until fragrant and soft, about 5 minutes.
In a medium bowl, beat together eggs, sour cream, flour and milk until thoroughly blended. Stir in crab, cheese and sautéed veggies. Season with Old Bay seasoning, cayenne pepper and dry mustard. Spread into prepared pie shell.
Bake in preheated oven for 40 to 45 minutes, or until a toothpick inserted in the center comes out clean.