Prepare your pizza sauce and put it in a small bowl. Mix in the chopped herbs of your choice.
Thinly slice the onion and pepper, grate the courgette.
Preheat the oven to 180C degrees. Line a large baking sheet with parchment paper.
Unroll the pastry and cut it into 4 rectangles, using a pizza cutter. Place these onto the lined baking sheet.
Using a blunt knife, draw a border line 1cm inwards from the edges - this will be the crust.
Using a silicon brush, coat the slices with the pizza sauce, up to the border line.
Scatter and arrange the sliced/grated veggies on top, add the grated cheese if used, then put the sheet in the oven.
Bake for 15-25 minutes until the crust is golden. Do check that that the pastry is cooked through - the base should not be soggy!
Serve warm or at room temperature with plenty of freshly ground pepper and a nice, crispy salad.