Step 1
Preheat the grill (or grill pan) to medium high heat. Cut the squash into long planks horizontally. They should be about 1/2-3/4 inch thick.
Toss the squash with olive oil, garlic powder, salt, and pepper. You can also brush the olive oil onto the planks and then sprinkle the seasoning on.
Step 2
Place directly on the grill and cook for 3-4 minutes per side. The yellow squash is ready to flip when it has nice grill marks and easily releases from the grill. If it is sticking, let it cook a little longer.