Preheat the oven to 200 degrees Celsius/ 400 degrees Fahrenheit.
Chop: If the bread is crusty, remove the rind. If it's soft, leave it. You will need about 30 g/1 oz breadcrumbs. Cut the slice of bread into cubes and pulse in the food processor until you obtain breadcrumbs. Transfer to a bowl. Cube all the cheese and process it as well; add it to the bowl with the breadcrumbs. Top and tail zucchini and carrots, peel the carrots. Cut into smaller pieces and process in the food processor until finely chopped. Alternatively, you can grate everything with a box grater.
Mix: Return fresh breadcrumbs and cheese to the food processor. Add the drained chickpeas, dry breadcrumbs, egg, spices, salt, pepper, and blitz until everything is mixed. Don't over blend! The mixture should be finely chopped but not become a paste. Adjust the taste again, be generous with the salt and pepper. If the mix is too wet and you cannot form the balls easily, add 1 or 2 extra tablespoons of breadcrumbs until you can form the balls. Do not add too many extra breadcrumbs; the mixture should be pretty soft.
Form: Brush the mini-muffin pan with olive oil. Form 24 balls about the size of a golf ball.
Bake: Place the balls into the muffin tin and bake for about 20 to 25 minutes, until golden brown. In the meantime, make the sauce.