A note on texture. As written, the kale ends up somewhere between a kale chip and sauteed kale - crisp edges and a tender center. If you want it more crisp, make sure your kale is completely dry and add 5 minutes to the baking time. If you prefer it less crisp, take 5 minutes off the baking time, giving it just enough time to wilt. The squash and fennel have some kick, if you don't like too much spice, eliminate the red pepper flakes.