Preheat oven to 400 degrees. Line a baking sheet with foil.
Cut top and bottom off of acorn squash. Scrape out inside and seeds. Cut the squash into rings.
Place the squash rings onto a baking sheet, spreading them out so they have room to bake evenly.
Bake for 15 minutes, or until softened.
While the squash rings are baking, mix the brown sugar, cinnamon, ginger, and salt in a small bowl.
Flip the squash rings when they are done. Brush with olive oil, drizzle with syrup, and sprinkle the seasoning mixture on top.
Bake again for 25 minutes, or until the edges are golden brown and the syrup and seasoning mixture has caramelized.
Remove from heat, garnish with fresh thyme, and serve.