Roasted Delicata and Red Onions

2 Delicata squash, halved, seeds removed, sliced into ½” slices crosswise
1 cup red onions, sliced thinly
2-4 garlic cloves, peeled, and smashed
Olive oil and maple syrup to taste
salt, thyme, and red pepper flakes to taste

Combine all ingredients in a bowl and toss to mix together thoroughly.  Spread out in one layer on baking sheet(s).  Roast in oven at 425* until tender and browning, tossing occasionally to prevent sticking, about 30-45 minutes.