Heat Half The Oil Over Medium-High Heat. Add Onions, Peppers And Half Of The Salt And Pepper. Cook, Stirring, For 5 Minutes Or Until Tender. Reserve. Add Remaining Oil To Pan. Crumble In Turkey, Add Garlic, Chili Powder And Remaining Salt And Pepper. Saute Until Brown, About 5 Minutes. Stir In Half The Chili Sauce And All Of The Ketchup. Bring To A Simmer. Serve Meat And Vegetable Mixtures With Tortillas And Bowls Of Remaining Chili Sauce, Cheese, Lettuce And Sour Cream To Make Your Own Fajitas.