Everything Savory Potato Waffles with Smoked Salmon

Name: Everything Savory Potato Waffles with Smoked Salmon
Ingredients: 1 tablespoon sesame seeds, toasted; 2 teaspoons poppy seeds; 1 teaspoon dried minced garlic; 1 teaspoon dried minced onion; 1/2 teaspoon kosher salt; 2 medium russet potatoes, peeled; 3/4 cup all-purpose flour; 1 teaspoon baking powder; 2 large eggs; 1/2 cup whole milk; 3 tablespoons unsalted butter, melted; 2 scallions, chopped; 8 ounces smoked salmon; 1/2 cup creme fraiche; 1 tablespoon capers; 1/4 cup small dill sprigs