gefüllt
filled
Describing the state in which a container, room, or object is filled with something.
Die Vase war mit frischen Blumen gefüllt.
The vase was filled with fresh flowers.

filled / stuffed
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filled
Describing the state in which a container, room, or object is filled with something.
Die Vase war mit frischen Blumen gefüllt.
The vase was filled with fresh flowers.

'Gefüllt' (filled / stuffed) is the past participle of the verb 'füllen' (to fill). It is used as an adjective to describe a state that resulted from the action of filling.
Der Bäcker hat die Krapfen frisch gefüllt.
The baker freshly filled the doughnuts.
The adjective 'gefüllt' (filled) is almost always used with the preposition 'mit' (with) and the dative. This pattern applies to both concrete and figurative meanings.
Die Schachtel war mit alten Fotos gefüllt.
The box was filled with old photos.
In culinary contexts, 'gefüllt' (stuffed / filled) often comes directly before the name of the dish. It then describes a method of preparation. Typical examples are 'gefüllte Paprika' (stuffed peppers), 'gefüllte Weinblätter' (stuffed grape leaves), or 'gefüllte Schokolade' (filled chocolate).
Als Hauptspeise gibt es heute gefüllte Zucchini.
Today's main course is stuffed zucchini.
full
'voll' and 'gefüllt' both have to do with something having content inside it. 'Voll' emphasizes that there is no or almost no space left. 'Gefüllt' emphasizes more that something has been provided with contents; often you also say what it is filled with. With food, 'gefüllt' is especially typical when there is a filling inside. The words can be confused because a filled container can also be full. But a glass can be filled without being completely full.

Zum Abendessen gibt es Paprika, die mit Reis und Gemüse gefüllt sind.
For dinner, there are bell peppers stuffed with rice and vegetables.
Die Tasche ist voll, ich kann kein weiteres Buch einpacken.
The bag is full; I can't pack another book.