1 (26-ounce) jar prepared pasta sauce
1 (10-ounce) box lasagna noodles
1 (11-ounce) container pesto
1 (15-ounce) container ricotta cheese
1 (12-ounce) bag baby spinach
1 cup grated Parmesan cheese
16 ounces mozzarella cheese, sliced
1/4 cup water
Put a spoonful of pasta sauce (about 1/4 cup) into the bottom of your slow cooker and swirl it around. Add a layer of uncooked lasagna noodles (you're going to have to break them to make a layer). Smear ricotta cheese and pesto onto the noodles. Add a handful or two of baby spinach, and top with a layer of Parmesan and slice mozzarella cheeses. Repeat layers until you've run out of ingredients. The spinach is fluffy, so you're going to have to squish it down to make it all fit.
Before closing the pot, put 1/4 cup of water into the empty pasta sauce jar and close and shake. Pour this saucy water over the top of everything.
Now cover up and cook on low for 6 hours, or on high for about 3 to 4. You'll know it's done when the top layer begins to brown and the cheese is melted and bubbly. It will also pull a bit away from the sides. Taste-test a noodle to check texture.
Uncover, and let it sit for 10 to 15 minutes before serving.
I love how fast and easy this is! Last Sunday I had Max assemble it right before we left for church, and it was ready to eat when we got home. I whipped up some super-fast breadsticks and we had a delicious dinner.