If you’re on the hunt for a hearty, protein-packed meal that feels like a warm hug on a busy day, you absolutely need to try this recipe for eatballs + More High Protein Slow Cooker. These high protein slow cooker turkey meatballs are tender, flavorful, and effortlessly come together while you go about your day. What’s better than a dish that combines wholesome ingredients, a comforting marinara sauce, and the slow cooker magic? Whether you’re fueling up after a workout or just craving a satisfying meal, this recipe delivers on protein and taste in one delicious package.

eatballs + More High Protein Slow Cooker Recipe - Recipe Image

Ingredients You’ll Need

Simple, fresh ingredients are the backbone of every great slow cooker recipe, and this one is no exception. Each component brings its own texture and vibrant taste, making these eatballs a true standout. From fragrant basil to lean turkey, every ingredient plays a vital role in turning humble meatballs into a mouthwatering feast.

1 small yellow onion: Adds subtle sweetness and moisture, finely grated for easy incorporation.
2 cups baby spinach (loosely packed): Boosts nutrition and keeps the meatballs tender and colorful.
1 cup fresh basil leaves (loosely packed): Infuses the dish with an aromatic, fresh herbal note.
1 tablespoon nutritional yeast (or freshly grated parmesan cheese): Gives a cheesy, savory depth without overpowering the meat.
1 teaspoon granulated garlic powder: Brings that essential garlicky warmth for classic flavor.
1 teaspoon kosher salt: Enhances all the natural flavors beautifully.
1 lb 93% lean dark meat ground turkey: The star protein, lean yet juicy, perfect for high protein slow cooker recipes.
2 teaspoons olive oil: Keeps those meatballs moist and adds a rich undertone.
1 (15-oz) jar marinara sauce: A bold, tangy coating that ties all the flavors together.
1 pound cooked spaghetti, red pepper flakes, fresh basil, parmesan, crusty bread: Classic accompaniments that elevate the serving experience.

How to Make eatballs + More High Protein Slow Cooker

Step 1: Prepare the Vegetables

The first step is all about texture and flavor layering. Grate the yellow onion finely—it will melt into the turkey, adding moisture and a mild sweetness without overwhelming any bite. Next, chop your spinach and basil finely, or pulse them briefly in a food processor for ease. These greens add freshness and a little pop of color, ensuring these meatballs won’t just taste amazing—they’ll look inviting too.

Step 2: Mix Your Meatball Ingredients

In the same bowl, combine the grated onion, finely chopped spinach and basil with nutritional yeast, garlic powder, and kosher salt. Stir everything well before adding the ground turkey. Then, mix carefully until all ingredients are evenly incorporated. This process ensures every meatball is infused with flavor, and the turkey stays juicy and tender after cooking.

Step 3: Prepare the Slow Cooker

Drizzle the olive oil into the bottom of your slow cooker and spread it around to create a thin, even coating. This helps prevent sticking and adds richness to the meatballs as they cook. Using a cookie scoop (or a large soup spoon), form the turkey mixture into small mounds directly in the slow cooker. Avoid rolling by hand as the turkey mixture is sticky—using a scoop ensures clean, uniform eatballs ready to cook evenly.

Step 4: Add the Sauce and Cook

Pour the marinara sauce gently over the meatballs, covering them completely but resist the urge to stir. This keeps the eatballs intact as they slow cook to tender perfection. Cover and cook on high for 4 hours or low for 6 to 8 hours. Before serving, carefully uncover and give the sauce a gentle stir to separate those perfectly cooked meatballs.

How to Serve eatballs + More High Protein Slow Cooker

Garnishes

Fresh basil leaves and a generous sprinkle of parmesan or dairy-free cheese add freshness and a savory finish that elevates these eatballs beyond everyday meatballs. For some heat, red pepper flakes bring a gentle kick that perfectly complements the rich tomato sauce.

Side Dishes

These high protein slow cooker meatballs pair beautifully with traditional spaghetti, or for a lighter touch, serve atop spaghetti squash. Crusty bread also makes a fantastic side, perfect for sopping up every last bit of delicious marinara sauce.

Creative Ways to Present

Try serving these eatballs as sliders with whole-grain buns and a dollop of fresh basil pesto for a crowd-pleasing party option. Alternatively, build a hearty meatball and veggie bowl topped with roasted vegetables and drizzled with extra virgin olive oil for a nourishing, colorful dinner.

Make Ahead and Storage

Storing Leftovers

Keep your leftover eatballs in an airtight container in the refrigerator. They’ll stay fresh for up to 3 days and remain just as flavorful, making them perfect for quick lunches or easy dinners.

Freezing

If you want to prepare ahead or save for a later meal, these meatballs freeze beautifully. Arrange them in a single layer on a baking sheet and freeze until firm, then transfer to a freezer-safe bag or container. They’ll stay great for up to 3 months.

Reheating

To reheat, either gently warm in the microwave or simmer on the stovetop in some additional marinara sauce to keep them moist and tender. Slow reheating helps maintain that juicy texture and keeps flavors intact.

FAQs

Can I use a different type of ground meat?

Absolutely! While this recipe is designed for lean ground turkey for a high protein boost, ground chicken, beef, or pork can also work well. Just adjust cooking times if needed and make sure to choose lean cuts for the healthiest option.

What if I don’t have nutritional yeast?

No worries. Parmesan cheese is a great substitute if you’re not dairy-free, offering a similar savory note. You can also omit this ingredient if necessary, though it does add a nice depth of flavor.

Do I have to soak the onion or spinach before adding?

No soaking is needed. Grating the onion finely and chopping the spinach keeps the mixture moist and blends seamlessly into the meatball base, so no extra prep is required.

Can I make these eatballs in the oven instead of a slow cooker?

Yes! Bake the meatballs on a parchment-lined baking sheet at 375°F (190°C) for about 20 minutes, then cover with marinara and bake for another 10 minutes. However, the slow cooker brings unmatched tender results with minimal effort.

How high is the protein content in these meatballs?

Thanks to the lean turkey and added spinach, these eatballs provide a nourishing punch of protein, making them perfect for active lifestyles or anyone seeking more high protein meals without sacrificing flavor.

Final Thoughts

There’s something truly comforting and satisfying about a meal that cooks itself slowly throughout the day, filling your home with irresistible aromas. These eatballs + More High Protein Slow Cooker recipes are a personal favorite for busy weeks when I want something fulfilling, nourishing, and fuss-free. I can’t wait for you to make these and experience just how delicious and easy high protein cooking can be. Give this recipe a try—you’ll be hooked!