Melt 1 tablespoon butter in a saucepan over medium heat. Whisk in 1 tablespoon flour to create a paste. Slowly add in water, stirring to incorporate. Stir in 1/2 cup milk and garlic base until mixture begins to bubble. Add turkey, carrots, celery, and onion and heat until warm, about 5 minutes. Mix in oregano, thyme,parsley, salt, and pepper. Remove from the heat and set aside.
Preheat the oven to 375 degrees F (190 degrees C). Spray an 8×6-inch casserole dish with cooking spray.
Whisk together 1 cup flour, baking powder, and salt for cobbler topping in a bowl. Cut in 3 tablespoons butter until the mixture resembles coarse meal. Gradually stir in 1/2 cup milk until dough pulls away from the side of the bowl.
Pour turkey filling into the prepared casserole dish. Drop cobbler topping on top and sprinkle with Italian seasoning and garlic granules.
Bake in the preheated oven until cobbler topping is golden brown, about 25 minutes.
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