Preheat the oven to 180C / 360F. (If your oven is fan assisted, make it 160c / 320F)
Press your pastry into an 8x8 inch square cake tin and trim off the ends. I like to leave the parchment paper it comes rolled in attached for maximum ease. My pastry doesn't go quite to the top on all sides, it's a little too narrow, so I press it in with my fingers and work it upwards a little. It doesn't have to be all the way up to the top, as long as it is most of the way the filling will fit no problem.
1 roll shortcrust pastry dough
Combine your grated veggies and cheese in a bowl and toss together. Add any flavorings / seasonings you've chosen to add, and then pour it into the cake pan.
1/2 large red bell pepper, 1/4 large carrot, 4-5 florets broccoli, OPTIONAL: 2 tbsp ranch seasoning OR 1 clove of garlic and a few pinches of dried or fresh herbs, 1 cup grated cheddar cheese
Whisk together the milk and eggs, then pour that over the veggies. Use a spoon to compact the veggies down if necessary and ensure they're all covered by the egg and milk mixture.
3 eggs, 2/3 cup whole milk
Bake for 30-40 minutes, or until the quiche is set with just a little wobble to it. Your cook time will vary depending on the size of dish you use, so keep a close eye on it.