In a skillet or frying pan, melt the butter over medium heat.
Once the butter has melted, add the panko breadcrumbs to the pan.
Stir the breadcrumbs continuously to coat them evenly with the melted butter. Cook for about 2-3 minutes or until the panko turns golden brown.
Sprinkle the salt, dried rosemary, and garlic powder over the breadcrumbs in the pan. Stir well to distribute the seasoning evenly.
Continue cooking for another minute or two, stirring frequently, until the panko becomes crispy and fragrant.
Remove the skillet from the heat and let the toasted panko topping cool slightly.
Sprinkle the toasted panko mixture over your favorite savory dishes such as Mac & Cheese, Chicken, or Fish.