Easy Slow Cooker Ravioli Lasagna with Ground Beef Step-by-step instructions

Before you start

Before beginning, gather all necessary ingredients and kitchen tools to ensure a smooth cooking process. Measure out the frozen ravioli, marinara sauce, and shredded mozzarella cheese. Finely chop the fresh parsley and set it aside for the final garnish.

Lightly grease the inside of the slow cooker insert with non-stick cooking spray to prevent the cheese and pasta from sticking to the sides. Set up the skillet on the stovetop and have a meat thermometer ready to verify the safety of the ground beef.

Instructions

Prep and Beef Browning

1. 1Brown the Ground Beef
   Place a large skillet over medium-high heat. Add the ground beef and Italian seasoning. Cook the beef, breaking it up with a wooden spoon, until it is completely browned and reaches a safe internal temperature of 160°F (71°C). Drain any excess grease from the skillet.
   Look for The meat should be fully browned with no remaining pink pieces.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Use a meat thermometer to guarantee the beef reaches 160°F (71°C) before proceeding.

At the end of this initial phase, the ground beef should be completely browned and crumbly, with no visible pink remaining. The kitchen will be filled with the rich, savory aroma of toasted Italian herbs and seasoned meat. Ensure the internal temperature has reached a safe 160°F (71°C) before draining the excess fat from the skillet and preparing to assemble the layers in the slow cooker.

Assembling the Layers

2. 2Layer Sauce and Ravioli
   Spread a thin layer of marinara sauce across the bottom of the slow cooker insert to prevent sticking. Arrange half of the frozen ravioli in an even layer over the sauce. Top the ravioli with all of the cooked ground beef, followed by half of the remaining marinara sauce.
   Look for The bottom should be lightly coated with sauce to protect the pasta.
   Tip Do not thaw the ravioli; using them frozen keeps them from turning mushy.
3. 3Add Remaining Layers and Cheese
   Layer the remaining frozen ravioli over the beef and sauce. Pour the rest of the marinara sauce evenly over the top, covering the pasta completely. Sprinkle the shredded mozzarella cheese in an even layer over the entire surface.
   Look for The cheese should cover all the pasta so it melts evenly.
   Tip Gently press down on the layers to ensure the pasta is submerged in sauce.

Once the assembly is complete, the slow cooker will be neatly layered with the red marinara sauce, frozen pasta, seasoned ground beef, and a generous blanket of white shredded mozzarella cheese. The ravioli should be mostly submerged in the sauce, which is crucial for even cooking. The cheese should completely cover the top layer, ready to melt into a gooey topping.

Slow Cooking and Garnishing

4. 4Slow Cook and Garnish
   Cover the slow cooker with its lid. Cook on low for 3 to 4 hours, or on high for 1.5 to 2 hours, until the pasta is tender and the cheese is fully melted and bubbling. Turn off the heat, scatter the fresh chopped parsley across the top, and let rest for 10 minutes before serving.
   Look for The cheese should be completely melted, and the sauce should bubble at the edges.
   Tip Keep the lid closed during cooking to maintain the steam needed to cook the frozen ravioli.

At the final checkpoint, the lasagna will be bubbling vigorously around the edges, and the mozzarella cheese on top will be fully melted, glossy, and slightly golden.

A gentle poke with a fork will confirm that the ravioli are tender all the way through. The addition of fresh green parsley provides a vibrant contrast to the rich, red sauce and white cheese, signaling that the dish is ready to rest and serve.

Common mistakes

One common mistake is thawing the ravioli before adding them to the slow cooker. Thawed ravioli cook too quickly, absorbing too much liquid and turning into a mushy, unrecognizable mass. Another error is skipping the bottom layer of marinara sauce.

Without a protective layer of sauce at the base of the insert, the bottom ravioli will dry out, scorch, and stick firmly to the slow cooker, making cleanup difficult and ruining the texture of the bottom layer.

How to tell it’s done

The lasagna is officially done when the pasta is tender and easily pierced with a fork, and the cheese on top is completely melted and bubbling.

Because the ground beef was previously cooked to a safe internal temperature of 160°F (71°C) in the skillet, the slow cooker's primary job is to heat the dish through and cook the frozen pasta. Let the lasagna rest with the lid off for ten minutes before serving to allow the sauce to thicken slightly.

• Ground meat: 160°F (71°C) in the thickest part