Pat the salmon fillet dry with paper towels and season both sides with sea salt and black pepper.
Heat one tablespoon of olive oil in a heavy-bottomed skillet over medium-high heat until shimmering.
Place the salmon in the pan skin-side down and sear for about 5 minutes until the skin is golden and crisp.
Flip the fillet and continue cooking for 2 to 3 minutes until the salmon is just cooked through, then remove from the pan to rest.
While the salmon cooks, rinse the cannellini beans and warm them in a small saucepan with a splash of water over low heat.
Mash the beans with the Greek yogurt and half a tablespoon of olive oil until they reach a velvety consistency, seasoning with salt to taste.
In the same skillet used for the salmon, add the remaining half tablespoon of olive oil along with the minced garlic.
Toss in the fresh spinach and sauté for 1 to 2 minutes until just wilted and vibrant green.
Spoon the white bean mash onto a plate, top with the sautéed spinach and the seared salmon.
Finish the dish with a generous squeeze of fresh lemon juice for a bright pop of flavor.