Warm Spinach Salad with Sausage and Potatoes

I adapted a recipe I found in Real Simple magazine to make one of the most delicious salads I've ever had. I roasted some onions, baby potatoes, mushrooms, garlic, tomatoes, red onion and asparagus in the oven. I tossed the spinach with the warm vegetables, sausage, feta cheese and a balsamic and mustard dressing. It was really quick and simple to make and tasted so unbelievably good. My kids,