Sweet Pepper Garlic Butter Pork Sirloin Roast

This slow-cooker pork sirloin roast is the ultimate set-it-and-forget-it dinner. A hefty roast, a pile of sweet peppers and onions, and a few pats of garlic-herb butter are all you need.

After hours of gentle simmering, the pork becomes impossibly tender, shredding at the slightest touch, and the peppers and onions melt into a rich, buttery gravy. Serve it over egg noodles for a hearty, satisfying meal that tastes like you spent all day in the kitchen—when you really just dumped it all in a Crockpot and walked away.

There are some recipes that just make sense. This one does: a pork sirloin roast, seasoned simply with salt and pepper, is nestled into a slow cooker with sliced bell peppers and onions. Then, a few medallions of garlic-herb compound butter are dropped on top. That's it. The slow cooker does the rest, transforming a lean cut of pork into a fork-tender, shreddable masterpiece.

The peppers and onions soften and release their natural sweetness, mingling with the melted butter and pork juices to create a luscious, savory gravy that's perfect for spooning over noodles or mashed potatoes. It's a hands-off meal that delivers big flavor with minimal effort.

Ingredients

Why this recipe works

The slow cooker is the perfect tool for a pork sirloin roast. This cut is lean, which means it can dry out if cooked too quickly. But low, slow, moist heat breaks down the connective tissue, turning it into succulent, tender meat that shreds effortlessly. The gentle simmering also allows the flavors of the peppers, onions, and garlic-herb butter to meld together, creating a rich, complex sauce that coats every strand of pork.

Using a compound butter is a simple way to infuse deep flavor without a lot of prep. The butter melts slowly, carrying the garlic and herbs throughout the pot as it cooks.

The peppers and onions provide a natural bed for the roast, keeping it slightly elevated and allowing the juices to circulate. This method requires minimal hands-on time—just a few minutes of prep and then the slow cooker takes over, making it an ideal weeknight dinner or meal-prep hero.

Notes and substitutions

Pork sirloin roast is a lean, boneless cut that works beautifully in the slow cooker. It's often more affordable than other roasts, making it a budget-friendly choice. If you can't find pork sirloin, you can substitute pork shoulder or butt, but you may need to increase the cooking time by an hour or two. The key is to cook until the meat is fork-tender, not just until it reaches a safe internal temperature.

The garlic-herb compound butter is what takes this dish over the top. You can use store-bought cowboy butter or make your own by mixing softened butter with minced garlic, chopped fresh herbs like thyme and rosemary, and a pinch of salt and pepper.

The butter melts into the sauce, adding richness and a punch of flavor. If you don't have compound butter, you can simply add a few tablespoons of butter and extra garlic and herbs to the pot.

• pork sirloin roast: pork shoulder or pork butt (boneless) can be used; cooking time may need to increase by 1-2 hours.
• garlic-herb compound butter: Use 4 tablespoons unsalted butter mixed with 2 minced garlic cloves and 1 teaspoon dried herbs (thyme, rosemary, oregano).
• bell peppers: Use any combination of sweet peppers, such as cubanelle or banana peppers.

Equipment

• 6-quart slow cooker
• Cutting board
• Chef's knife
• Serving spoon
• Plate