No. Appetizers aren't included in the regular dining plan. Nor are they included at signature restaurants just because of the 2-credit cost. You have to go deluxe to get the appetizers.
You would probably be able to get one at CRT as it's a fixed price restaurant, but that is it.
As Nala stated, only the deluxe dining plan are you allowed an appetizer. When at a signature restaurant, you are not paying more for food, you are paying for "atmosphere".
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