Thaw the salmon fillet if frozen, then pat dry with a paper towel and season both sides with sea salt, black pepper, and garlic powder.
Bring a small pot of water to a boil, lower the egg in, and simmer for 6.5 minutes for a jammy yolk; immediately transfer to an ice bath to stop the cooking.
Heat the avocado oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon in the pan and sear for 4-5 minutes until the edges are crisp and golden, then flip and cook for 2-3 more minutes until opaque.
In a serving bowl, combine the baby spinach with the warm cooked quinoa and cooked brown lentils as the base.
Place the seared salmon fillet on top of the grains and greens.
Peel the soft-boiled egg, slice it in half to reveal the liquid gold center, and add it to the bowl.
Drizzle the entire bowl with fresh lemon juice before serving for a bright, clean finish.