This 5-ingredient slow cooker Earth Day salmon hash is built for busy home cooks who still want something thoughtful and nourishing on the table. You start with frozen raw salmon fillets straight from the freezer and layer in just four basic pantry and produce items. A few hours later, you’ve got a gently flaked salmon and potato hash that feels comforting and a little special—exactly the kind of dish that has friends asking how you pulled it off with so little effort. While “hash” has roots in frugal European and American cooking traditions—using up odds and ends in one pan—this version leans into simple, whole ingredients and low-waste cooking, which makes it especially fitting for an Earth Day meal.
Serve the salmon hash warm, scooped into shallow bowls. It’s lovely topped with a squeeze of fresh lemon and a handful of chopped herbs if you have them, but it’s also satisfying as-is. Pair it with a crisp green salad or steamed green beans to add color and texture. A slice of crusty bread or whole-grain toast on the side turns it into a hearty brunch, while a light cucumber salad and sparkling water with citrus make it feel like a relaxed, earth-conscious supper.
Slow Cooker Earth Day Salmon HashServings: 4
Ingredients
1 1/2 pounds frozen raw salmon fillets (about 3–4 small fillets, unthawed)
1 1/2 pounds russet or gold potatoes, diced into 1/2-inch cubes
1 medium yellow onion, finely chopped
3 tablespoons olive oil (or other neutral cooking oil)
1 teaspoon kosher salt, plus more to taste
1/2 teaspoon freshly ground black pepper, plus more to taste
1/4 cup water
Directions
Lightly oil the bottom of your slow cooker crock with a teaspoon of the olive oil to help prevent sticking and make cleanup easier.
Spread the diced potatoes evenly over the bottom of the slow cooker, then scatter the chopped onion on top. Drizzle with the remaining olive oil, and sprinkle with the salt and black pepper. Toss gently with a spoon or your hands so the potatoes and onions are lightly coated and seasoned.
Pour the water around the edges of the potatoes and onions; this creates a bit of steam and helps the vegetables cook evenly without drying out.
Place the frozen raw salmon fillets in a single layer directly on top of the potato and onion mixture. They should be solidly frozen—no need to thaw. If the fillets have skin, place them skin-side down. Lightly sprinkle a pinch of additional salt and pepper over the top of the salmon.
Cover the slow cooker with the lid and cook on LOW for 3 1/2 to 4 1/2 hours, or until the potatoes are tender when pierced with a fork and the salmon flakes easily in the thickest part. Avoid lifting the lid more than once or twice, as heat loss will lengthen the cooking time.
Once the salmon is cooked through (it should be opaque and flake easily, with an internal temperature of at least 145°F / 63°C), use two forks to gently break it into large flakes right in the slow cooker. Remove any skin that has loosened and discard it, if desired.
Gently fold the flaked salmon into the potatoes and onions until everything is evenly combined, being careful not to mash the potatoes too much. Taste and adjust seasoning with additional salt and pepper if needed.
Turn the slow cooker to WARM and let the hash sit for 5 to 10 minutes to allow flavors to meld slightly before serving. Serve the salmon hash straight from the crock, with optional lemon wedges and fresh herbs if you have them on hand.
Variations & Tips
For a more vegetable-forward hash, add 1 to 2 cups of chopped sturdy vegetables—such as bell peppers, carrots, or celery—on top of the potatoes and onions before adding the salmon. If you’d like a smokier profile, sprinkle 1/2 teaspoon of smoked paprika over the potatoes with the salt and pepper. To give the dish a brunch feel, top each serving with a soft-cooked or poached egg. For a creamier texture, stir in 2 to 3 tablespoons of plain Greek yogurt or sour cream at the very end, off heat, adjusting salt as needed. You can also swap part of the potatoes for sweet potatoes for a subtle sweetness and extra color.
Food safety tips: Always start with properly frozen, high-quality salmon fillets; keep them in the freezer until you’re ready to place them in the slow cooker so they don’t sit in the temperature “danger zone.” Place the frozen fillets on top of the vegetable layer, not buried deep inside, so they heat more evenly. Cook on LOW only, as most slow cookers reach a safe temperature more consistently on this setting for fish; aim for an internal temperature of at least 145°F / 63°C in the thickest part of the salmon before flaking. Do not leave the finished hash on the WARM setting for more than 2 hours, and refrigerate leftovers in a shallow container within 2 hours of cooking. Reheat leftovers gently on the stovetop or in the microwave until steaming hot throughout.
