Quick Vegetable Saute

Heat a 12-inch nonstick skillet over high heat and, when hot, add the olive oil . When the oil is hot, add the butter and, when melted and beginning to bubble, add the peppers and carrots and cook, stirring occasionally, until beginning to soften, about 3 minutes. Add the onion and cook, stirring, until crisp-tender, about 3 minutes longer. Add the zucchini and season with salt and pepper and cook until crisp-tender, 2 to 3 minutes longer. Serve immediately.