Preheat oven to 450F or 425F convection. Line a baking sheet with parchment paper.
Add the potatoes, bell peppers, 2 tablespoons olive oil, 1 teaspoon salt, and pepper and toss to coat. Spread into an even layer and bake for 20-25 minutes or until the potatoes are starting to turn golden in spots.
Make 4 spaces on the sheet for the salmon filets and place the filets there. Scatter the green beans around the salmon and drizzle the salmon and green beans with the remaining 1 tablespoon oil and sprinkle with remaining ½ teaspoon salt. Use your hands to rub the oil and salt to coat the salmon flesh.
Bake for 10 more minutes or until the salmon is cooked through and green beans are crisp tender.
In a medium bowl, mix together the yogurt, cucumber, herbs, lemon, dijon, salt, and pepper until combined. Serve the salmon and veggies topped with tzatziki, nuts, herbs, and a squeeze of lemon.