Follow the steps in order for the best result.
In a small bowl, thoroughly combine the cornstarch and chicken broth. Ensure there are no lumps, then set the mixture aside.
In a saucepan over medium heat, melt the butter. Add the chili powder, black pepper, garlic powder, and red pepper. Cook in the hot butter, stirring constantly, for about one minute to allow the spices to bloom and release their flavors.
Pour the cornstarch and broth mixture into the saucepan with the spiced butter. Bring the mixture to a boil, whisking continuously over high heat. Continue whisking until the sauce begins to thicken slightly, achieving your desired consistency.
Remove the saucepan from the heat. The Cajun butter sauce is now ready to serve. Drizzle generously over your favorite vegetables for an extra kick of flavor.