Marinate the Salmon: Preheat the oven to 400°F (200°C). In a small bowl, mix together the olive oil, balsamic vinegar, lemon juice, lemon pepper, dried oregano, garlic powder, sugar, and salt. Rub this mixture all over the salmon fillets, making sure they are evenly coated. Let the salmon marinate for at least 10 minutes while you prepare the dill sauce and salsa.
Bake the Salmon: Arrange the salmon fillets on a baking sheet lined with parchment paper. Cook in the preheated oven for 12 to 15 minutes, or until the fish easily flakes apart when tested with a fork.
Prepare the Dill Sauce: While the salmon is baking, whisk together the Greek yogurt, mayonnaise, chopped dill, garlic, lemon juice, red wine vinegar, dried oregano, dried parsley, salt, and pepper in a small bowl.
Make the Greek Salsa (Optional but Recommended): In a medium bowl, toss together the cherry tomatoes, chopped cucumber, kalamata olives, red onion, feta, jalapeno (or red pepper flakes), chopped dill, minced garlic, olive oil, red wine vinegar, lemon juice, dried oregano, salt, and pepper. Stir until everything is well combined.
Serve: Serve the baked salmon with a generous drizzle of dill sauce and top with the Greek salsa if desired. Pair with a side of your choice, such as quinoa, rice, or roasted vegetables, for a complete meal.