Can I use whipped ricotta in lasanga? I accidentally bought whipped instead of regular.

Hello Susan! Long story short: You can use whipped but you'll likely notice the difference. The difference is primarily in texture - Whipped ricotta tends to be smooth and creamy, whereas regular ricotta typically has some size of curd still in tact so it's a little clumpy or "grainy" for lack of a better word. Because the curds are broken down in whipped, when it's cooked and added to the lasagna, whipped ricotta may leak a bit more from the sides and may not be noticeable in the lasagna layers.

But I bet it'll still be darn delicious either way :)