Slow Cooker French Onion Pork Medallions

This slow cooker recipe turns pork tenderloin medallions into a rich, French onion–inspired dinner with minimal effort. Sweet Vidalia onions, fresh thyme, and a creamy Gruyère sauce simmer together while the pork becomes fork-tender.

Just layer everything in the slow cooker and walk away—hours later, a deeply savory, comforting meal awaits. Serve it over mashed potatoes for a complete, satisfying plate.

French onion soup meets pork tenderloin in this effortless slow cooker dish. Thick medallions of pork cook low and slow with sweet onions, fresh thyme, and beef broth until they're meltingly tender.

A final addition of heavy cream and shredded Gruyère creates a luscious, nutty sauce that coats every bite. The hands-off method makes this perfect for busy weeknights, and the result tastes like you simmered it all day—because you did.

Ingredients

Why this recipe works

The slow cooker's gentle, moist heat breaks down the pork's connective tissue, turning lean tenderloin medallions into fork-tender morsels without drying them out.

Cooking on low for several hours allows the onions to soften and release their natural sugars, creating a sweet, caramelized base that mirrors the flavor of French onion soup. The beef broth adds savory depth, while the thyme infuses the sauce with an herbal note that brightens the richness.

Adding the cream and Gruyère at the start lets the cheese melt slowly into the broth, forming a silky, emulsified sauce. The cheese's nuttiness complements the sweet onions and pork, while the cream rounds out the acidity of the broth.

Because everything cooks together, the flavors meld and deepen over time, producing a cohesive dish that tastes far more complex than its simple ingredient list suggests.

Notes and substitutions

Choose pork tenderloin medallions that are about 1 inch thick for even cooking. If the medallions are thicker, cut them slightly to ensure they cook through at the same rate. Vidalia onions are ideal for their sweetness, but any sweet onion variety works; yellow onions can be used for a more savory flavor. Fresh thyme is essential—dried thyme won't provide the same aromatic quality.

Gruyère is the classic choice here, but Swiss or Emmental can be substituted without changing the dish's character. Heavy cream is necessary for the sauce's richness; half-and-half will produce a thinner sauce, though you can thicken it with a little flour before serving. For a lighter version, use chicken broth instead of beef broth, and serve over cauliflower mash or roasted vegetables.

• Vidalia onions: Sweet onions like Walla Walla or Maui, or yellow onions for a sharper flavor.
• Gruyère cheese: Swiss cheese or Emmental for a similar nutty, melty result.
• Beef broth: Chicken broth or vegetable broth for a lighter base.
• Heavy cream: Half-and-half mixed with 1 tablespoon of flour to thicken, if a lighter sauce is preferred.

Equipment

• Slow cooker (6-quart)
• Cutting board
• Chef's knife
• Measuring cups
• Measuring spoons
• Wooden spoon
• Serving spoon