Heat Oil In A Large, Heavy Nonstick Skillet Over Medium Heat. Add Bell Pepper And Onion And Stir-Fry For 3-4 Minutes. Add Sausage And Stir-Fry For 2 Minutes. Add Zucchini, Mushrooms, Italian Seasoning And 1/4 Tsp Black Pepper. Stir-Fry Only Until Crisp. Remove From Heat, Add Vinegar And Toss To Coat All Ingredients. Meanwhile, Microwave Polenta Rounds In Covered Container For 1 To 2 Minutes Or Until Hot Throughout. Portion 2 To 3 Polenta Rounds On Each Plate And Top With Sauteed Vegetables.