Place potatoes in microwave-safe bowl; sprinkle with water.
Cover, venting one corner. Microwave on HIGH 5 to 8 minutes just until potatoes are tender. (Time will depend on wattage of your oven.)
Meanwhile, heat oil in large nonstick skillet over medium-high heat. Add and break up turkey; cook 5 minutes, tossing occasionally. Mix in carrot; cook 2 minutes. Add potatoes and onions; cook and toss 2 minutes.
Reduce heat to medium; mix in tomato sauce, cheese, and herbs. Cook, stirring occasionally, 4 to 5 minutes until mixture is hot and most of sauce is absorbed. Season with salt and pepper.
On work surface, lay out tortillas. Place hot turkey mixture on each; fold and roll up as for burritos. Cut in halves and place on serving plates. Accompany with sour cream, if desired