Pre-heat the oven to 180C / 360 F. Line a 9-inch baking tin with baking paper. Ensure you have enough overlap to be able to lift the slice out of the tin once cooked.
Cut the cheese into pieces and add to the Thermomix bowl. Grate for 5 seconds / speed 8. Set aside.
Top and tail the zucchini. Cut each zucchini into four pieces and add to the bowl. Grate for 5 seconds / speed 5. Set aside with the cheese.
Peel and quarter the onion and add to the Thermomix bowl. Chop for 5 seconds / speed 5.
Add the chopped bacon and 20g of the olive oil to the bowl. Saute for 5 minutes / 120 degrees / speed 1.
Add the eggs, flour, grated cheese, grated zucchini and remaining 50g of olive oil to the bowl. Season with salt & pepper and mix for 10 seconds / REVERSE / speed 4.
Pour into the prepared baking tin.
Bake in the oven for 30 minutes.
Remove from oven and leave in the tin to cool for 5 - 10 minutes to firm up. Then use the baking paper to lift the slice from the tin and cut into slices.