Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the yellow potatoes into 0.5-inch cubes and spread them evenly on the prepared baking sheet.
Season the potatoes with half of the sea salt, black pepper, and garlic powder, then roast for 25-30 minutes until tender and golden brown.
While the potatoes are roasting, combine the low-fat cottage cheese, dried dill, and lemon juice in a small bowl and stir until well mixed.
Season the salmon fillet on both sides with the remaining sea salt, black pepper, and garlic powder.
Heat a high-quality non-stick skillet over medium-high heat without any oil.
Place the salmon in the hot skillet skin-side down and sear for 4-5 minutes until the skin is crispy and the fish releases easily from the pan.
Flip the salmon and cook for another 3-4 minutes until the center is just opaque and the fish is flaky.
Place the fresh baby spinach in a serving bowl and top with the hot roasted potatoes and the seared salmon fillet.
Finish the bowl with a dollop of the herbed cottage cheese and serve immediately.