There are many things you can do with leftover lasagna noodles. Here are some ideas from the search results:

1. Fried Pasta Nachos: Cut the leftover lasagna noodles into triangles and fry them up like chips. Then, top them with your favorite nacho toppings.

2. Spinach Lasagna Roll-Ups: Roll the leftover lasagna noodles with spinach and cheese, and bake them in the oven.

3. Tagliatelle: Cook the leftover lasagna noodles and then cut them into tagliatelle. This is a fancy way to use up the noodles.

4. Break them up and add to soup: Break the leftover lasagna noodles into pieces and add them to a vegetable or chicken soup.

5. Blue-sagna: Make a white sauce with lots of gorgonzola dolce and a little wine. Layer this with fresh or frozen spinach and the leftover lasagna noodles.

6. Lasagna Chips: Cut the leftover lasagna noodles into pieces, brush them with oil, and sprinkle them with breadcrumbs and cheese. Then, bake them in the oven for a crispy snack.

7. Broken Lasagna Noodle and Mushroom Skillet: Cook the leftover lasagna noodles with mushrooms and parmesan cheese in a skillet.

These are just a few ideas, but there are many more ways to use up leftover lasagna noodles.