Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and cube the sweet potato and beets into half-inch pieces to ensure even cooking.
Toss the sweet potatoes and beets with 0.25 tablespoons of olive oil and a pinch of the sea salt and black pepper.
Spread the vegetables on the baking sheet and roast for 20-25 minutes until they are fork-tender.
While the vegetables roast, season the salmon fillet with the dried oregano and the remaining salt and pepper.
Heat the remaining 0.25 tablespoons of olive oil in a non-stick skillet over medium-high heat.
Place the salmon skin-side down in the skillet and sear for 4-5 minutes, then flip and cook for another 3-4 minutes until flaky.
Add the chopped bell peppers and halved cherry tomatoes to the skillet during the last 3 minutes of salmon cooking to lightly blister them.
Shred the romaine lettuce and place it in a large bowl or on a plate.
Top the greens with the roasted root vegetables, blistered tomatoes, and peppers, then finish with the seared salmon fillet.