Sauté the veggies: Heat 1 tablespoon olive oil in a skillet over medium heat. Add onion and red bell pepper and cook 3–5 minutes, until soft. Remove from heat and let cool slightly.
Mix the patties: In a large bowl, gently flake the salmon. Add the quinoa, cooked vegetables, egg, Greek yogurt or mayo, ¼ cup panko, parsley, dill, lemon juice, garlic powder, salt, and pepper. Stir just until combined, keeping the salmon flaky.
Chill & shape: Refrigerate the mixture for 10 minutes to help it firm up. Form into 10–12 small patties, about 2–3 inches wide. Coat each patty in the remaining ¼ cup panko breadcrumbs.
Bake: Preheat oven to 400°F. Place patties on a parchment-lined, lightly oiled baking sheet. Bake 12–15 minutes, flipping halfway.
Pan-fry: Heat remaining olive oil in a skillet and cook patties 3–4 minutes per side until golden.
Rest & serve: Let patties rest for 5 minutes before serving.