Preheat the oven to 350°F (175°C).
In a mixing bowl, cream together the softened butter and sugar until light and fluffy.
Add the egg and vanilla extract to the mixture, mixing until well combined.
Gradually add in the flour, salt, and shredded cheese, mixing until just combined.
Fold in diced vegetables gently to distribute them evenly.
Spoon the mixture onto a lined baking sheet, spacing them about an inch apart.
Bake in the preheated oven for 15-20 minutes or until golden brown.
Allow the snacks to cool slightly before serving.