Preheat oven to 400°F and line a baking sheet with parchment paper.
Halve the radishes and dice the turnips into small cubes.
Toss the vegetables with the olive oil, sea salt, pepper, and garlic powder on the prepared baking sheet.
Roast the vegetables for 20 minutes until tender and slightly golden.
While roasting, pat the salmon dry and season with a pinch of salt and pepper.
Heat a non-stick skillet over medium-high heat until hot.
Sear the salmon skin-side down for 4 minutes, then flip and cook for 3 more minutes until flaky.
In a small bowl, whisk together the Greek yogurt, lemon juice, and chopped chives to create the sauce.
Assemble the bowl by placing the roasted vegetables at the bottom, topped with the salmon and a dollop of the creamy yogurt sauce.