Preheat the oven to 450 F and line a sheet pan with tinfoil (for easier cleanup, if desired).
Drizzle approx. 2 tbsp. of olive oil onto pan, then add potatoes. Season with salt/pepper or desired seasoning, then bake 15 minutes.
Add dill, Greek yogurt, garlic, lemon juice and salt to taste in a food processor or blender. Process or blend until dill is fully blended and specks of dill are no longer visible. (Note: If you prefer a thicker dressing, use the juice of only ½ of a lemon)
After potatoes have baked for 15 minutes, move potatoes to one side of the pan and add seasoned salmon fillets into the center. Cook for 7 minutes, then drizzle approx. 1 tbsp. olive oil on the empty side of the pan, add asparagus, and season with salt/pepper. Cook all 3 ingredients together for 8 more minutes. (Note: Be sure to cut into the salmon to ensure it’s fully cooked.)
When ingredients on the sheet pan have cooled to nearly room temperature, cut the salmon fillets into bite-sized pieces.
Toss lettuce, carrots, tomatoes and onion together in a salad bowl, and add dressing if desired. Add potatoes and asparagus and gently toss. Top with salmon pieces and serve.