Chef John's Fresh Salmon Cakes

Name: Chef John's Fresh Salmon Cakes
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: American
Ingredients: 1 tablespoon extra-virgin olive oil; 0.25 cup minced onion; 2 tablespoons minced red bell pepper; 2 tablespoons minced celery; salt and pepper to taste; 1 tablespoon capers; 1.25 pounds fresh wild salmon, coarsely chopped; 0.25 cup mayonnaise; 0.25 cup panko bread crumbs; 2 cloves garlic, minced; 1 teaspoon Dijon mustard; 1 pinch cayenne pepper; 1 pinch seafood seasoning (such as Old Bay®); 1 tablespoon panko bread crumbs, or to taste; 2 tablespoons olive oil, or as needed