Use a spiral slicer to cut the squash into long thin strips. If you donu2019t have a slicer, use a vegetable peeler to cut the squash into long ribbons. If you use a peeler, donu2019t try to peel the seedy core.
Heat the olive oil in a skillet over medium heat. Add the garlic and squash noodles and toss to coat. Toss the noodles in the pan until they are beginning to wilt but are still crunchy. Be careful not to overcook them; otherwise, you will have a pan of mush. Remove from the heat immediately.
Gently stir in the pesto. Season with salt and pepper. Transfer to a serving platter.
Top the noodles with a dollop of ricotta cheese and a sprinkle of Parmesan cheese and chopped herbs.