Preheat oven to 400 °. Line a baking sheet with parchment paper. Pat salmon dry with paper towels. Place on baking sheet, salt and pepper to taste, and bake for 10-15 minutes until opaque.
Remove the skin from the salmon after it's baked.
In a skillet, melt butter and olive oil. Once the pan is hot add onions, celery, bell pepper and cook partially covered for 8 minutes. Stir occasionally.
Remove lid then add hot sauce, Old Bay seasoning, stir. Continue cooking for about 8 minutes, or until vegetables are softened. Stir occasionally.
In a medium size bowl, flake the salmon and add the vegetables. Stir to combine.
Mix together breadcrumbs, mayonnaise, Greek yogurt, Dijon mustard and eggs. Add mixture to the salmon and stir to thoroughly combine.
Form salmon croquettes using a scant 1/4 of a cup. Place on a plate and chill in the refrigerator for 30 minutes.
Preheat oven to 400 °.
Line a baking sheet with parchment paper. Place salmon croquettes on the prepared baking sheet.
Bake for 12 minutes. Flip the croquettes and bake an additional 12 minutes.
Serve.