Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine salmon, breadcrumbs (or substitute), egg, onion, mustard, parsley, garlic powder, salt, and pepper. Mix well.
Form the mixture into 8 evenly-sized patties. Chill in the fridge for 30 minutes to help them hold together.
Place patties on the prepared baking sheet and lightly brush with olive oil or spray with cooking spray.
Bake for 15-20 minutes, flipping halfway, until golden brown and cooked through.
Serve warm with roasted vegetables, quinoa salad, or mixed greens.