Tomato and Spinach tart

Heat oven to 180c line a pastry tin with short crust pastry, blind bake.
Heat a saucepan and add olive oil add one diced onion and 1 cup baby spinach chopped
Layer onto base of tart
Whisk together 3 eggs, 1/3 cup milk, 1/3 cup tasty cheese
Pour into case
Top with sliced cherry tomatoes
Bake until set about 20 mins