To prepare gremolata, combine first 6 ingredients in a small bowl. Set gremolata aside.
To prepare squash, combine pattypan squash, zucchini, and 2 teaspoons oil. Sprinkle with salt and pepper. Arrange squash, cut side down, in a single layer on a jelly-roll pan. Bake at 475° for 15 minutes or until squash is tender and lightly browned, stirring after 7 minutes. Sprinkle gremolata over the squash. Serve immediately.
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