Melt butter in a small saucepan over medium heat. Add garlic and cook until fragrant, 30 seconds to 1 minute. Whisk in flour and stir until combined and the flour loses its raw smell, 30 seconds to 1 minute. Gradually whisk in milk, oregano, basil, and parsley, and bring to a simmer, 3 to 5 minutes. Continue cooking, stirring constantly, until thick, about 5 minutes.
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