When the noodles are cooked through you will notice the sauce boiling around the edges of the pan. Insert a toothpick into the lasagna. If the toothpick goes in easily without a lot of resistance, the noodles are done, and your lasagna is ready.

How long should you leave lasagna in the oven?

Cover the lasagna pan with aluminum foil, tented slightly so it doesn't touch the noodles or sauce). Bake at 375°F for 45 minutes. Uncover in the last 10 minutes if you'd like more of a crusty top or edges. Allow the lasagna to cool at least 15 before serving.

Can you overcook a lasagna?

First things first, you have to be sure not to overcook your noodles, warns Bon Appétit. Associate food editor Rick Martinez recommends boiling for just 4 to 5 minutes (because don't forget, they'll be hanging out in the oven for some time, and mushy noodles are nobody's favorite part of a lasagna).