First is to prepare all the needed ingredients.
Grab a bowl and put the 1 & ½ cup of flour, 1 tablespoon sugar and add ½ teaspoon salt and mix it well.
After that add ½ cup of butter and mix it and add 3 tablespoon cold milk.
Knead the dough mixture with your hand and after that rest the dough for 1 hour.
Flatten the dough, put it into the pan and use a fork to flatten the edges.
put the parchment paper and add the dry beans as a (pie weight to ensure a flaky and not soggy pie crust)
Bake it for 15 minutes.
Cook the tuna into the pan and add 1 can of small mushrooms,1 piece of white onion and mix it well.
After that you need 3 eggs and add ½ cup of milk,½ teaspoon salt, ½ teaspoon black pepper , ½ teaspoon garlic powder.
add ¼ cup parsley and ½ cup of grated cheese and mix it well.
Add the tuna and mushrooms into the pie and pour the egg mixture,add ¼ cup milk and mix it well.
Bake it for 50 minutes.