Cut squash into 1” thick slices and place in a bowl. Toss with the cumin and oil and a sprinkle of salt and pepper.
Spread out into an even layer on a parchment lined baking sheet. Bake at 425°F for 30 minutes or until tender. Place under broiler for last few minutes to brown tops.
For sauce, combine all ingredients and season to taste with salt and pepper. Add a bit of water if necessary to loosen until you get the consistency you desire, then drizzle over baked squash to serve.