In a small saucepan over medium-low heat, melt the butter.
3 tablespoons salted butter
Whisk in the flour. Continue whisking until you see no streaks of white.
3 tablespoons all-purpose flour
Gradually whisk in the chicken stock. You want to start by adding about a tablespoon at a time, only adding more when what you just added is absorbed. While you should take your time with this, the whole process will take less than a minute.
1 cup chicken broth
Stir in the milk and the spices. Continue stirring, bringing the mixture to a simmer. Simmer for 5 minutes while stirring to prevent burning.
1/2 cup milk, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/2 teaspoon kosher salt, 1/4 teaspoon black pepper
Use right away or store in an air-tight container in the refrigerator for up to three days.