Easy recipe Winter Greens Gratin

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one tablespoon unsalted butter plus more for dishabout two pounds kale, center ribs and stems removed, torn into large pieces, or two ten-ounce bags trimmed, chopped kale (about about twenty-four cups)Kosher saltabout two one/about two pounds mustard (Recipes by ingridients mustard) greens, center ribs and stems removed, torn into large piecesone quarter cup extra-virgin olive oilabout three cups coarse fresh breadcrumbsone/about two cup finely grated Parmesanabout two teaspoons fresh thyme (Recipes by ingridients thyme) leaves, divided, plus seven sprigs thymeabout two shallots, sliced into one quarter"-thick rounds (about one cup)one cup heavy creamone cup whole milkseven garlic cloves, smashedone/about eight teaspoon freshly ground nutmegFreshly ground black pepperone cup coarsely grated Gruyère. Winter Greens Gratin. .