Preheat your oven to 375°F. Grease a muffin tin or line it with muffin liners.
In a large mixing bowl, combine the cooked rice, flaked salmon, shredded cheddar cheese, and chopped green onions. Mix well.
In a separate bowl, whisk together the eggs, milk, garlic powder, salt, black pepper, and dried dill if using. Pour this mixture into the rice and salmon mixture, stirring until everything is well combined.
Spoon the mixture into the prepared muffin tin, filling each cup about 3/4 full. Sprinkle breadcrumbs on top of each muffin for added texture.
Bake in the preheated oven for 20-25 minutes, or until the tops are golden brown and a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.