Preheat oven to 450 degrees F. Line a sheet pan with parchment paper or a silicone baking mat.
Toss the sliced zucchini and squash together with the olive oil, salt, and pepper in a large bowl. Spread slices in a single layer on the prepared sheet pan.
Bake for 10-15 minutes, until the veggies are tender and lightly browned around the edges.
