Step 1: Prepare the Spinach Filling : In a medium bowl, mix ricotta, Parmesan, spinach, garlic powder, salt, pepper, and Italian herbs until well combined.
Step 2: Cook the Lasagna Noodles : Cook noodles according to package instructions until al dente. Drain and lay flat on a clean surface or parchment paper to prevent sticking.
Step 3: Assemble the Rolls : Spread a generous layer of the spinach-ricotta filling onto each noodle. Sprinkle a small amount of mozzarella over the filling. Roll the noodles tightly from one end to the other.
Step 4: Prepare the Crockpot : Grease the bottom of the crockpot with olive oil. Spread a thin layer of marinara sauce on the bottom. Place the lasagna rolls seam-side down in the crockpot, side by side. Pour remaining sauce over the top of the rolls. Sprinkle remaining mozzarella cheese over the sauce.
Step 5: Cook the Lasagna Rolls : Cover and cook on low for 3–4 hours or on high for 2–3 hours. The cheese should be melted, and the rolls should be tender.