Preheat oven to 180 C / 355 F. Grease and line a slice pan with baking paper. You will need a pan the size of around 19 cm x 29 cm or 7”x12”, or similar. Some pans are smaller but deeper, in which case the thickness of the slice might require a little longer cooking time.

Heat the olive oil in a frying pan over medium-high heat. Add the onion and cook, stirring for 5-6 minutes or until it softens. Set aside.

Grate the zucchini. Using your hands and in batches, squeeze some of the juice from the zucchini over the sink. This will remove some of the moisture that might otherwise result in a soggier slice.

Chop the broccoli, spinach and garlic and set aside.

Whisk the eggs with salt, pepper and mustard. Add the flour and whisk until smooth and thick.

Add cottage cheese, grated cheese, cooked onion, grated zucchini, broccoli, peas and spinach and combine. Add the olive oil and fold through until everything is well incorporated.

Transfer the mixture into the prepared pan and smooth the surface.

Bake for 35 minutes or until golden brown and cooked through. If you like a slightly crispier top, pop the slice under a grill/broiler for a few minutes at the end.

Set aside to cool slightly before transferring the slice onto a clean board. Cut into pieces and serve warm or at room temperature.