Heat oven to 375. Place beets, bay leaf, garlic and thyme in a 9" x 13" baking pan. Add 1/3 cup water. Cover w/ foil and roast 1 hr, or until beets are tender. Uncover and let cool.
Place walnuts on a bakinh sheet and bake 7 mins, or until toasted. Rub beets to remove skin, cut into quarters. In bowl, whisk olive oil, balsamic vinegar, kosher salt and pepper together. Reserve 2 tbsp dressing. In a lg bowl toss beets w/ remaining dressing and 2 tbsp parsley.
Spray a baking sheet w/ cooking spray. Place goat cheese on baking sheet. Bake 5 mins, or until hot and just beginning to melt. Toss baby greens w/ reserved dressing in lg bowl. Add remaining parsley. Arrange greens on lg platter, top w/ beets. Spoon cheese over beets and sprinkle w/ walnuts.