Roll out the refrigerated pie dough on a kitchen surface dusted with flour until it's about 12 inches in diameter.
Transfer the pie crust to a 9-inch pie tin, pressing it down along the bottom and sides. Trim off any of the excess. Using a fork, crimp the edges and prick the bottom of the crust several times.
Par-bake the crust for 15 minutes. Remove.
In a large bowl, whisk the eggs until frothy. Add the milk, salt, Mozzarella cheese, and baby spinach.
In a separate bowl, whisk together the cottage cheese, ricotta, and Parmesan.
Transfer the egg mixture into the pie crust. Drop spoonfuls of the cottage cheese mixture, then sprinkle the cherry tomatoes.
Bake the quiche for 45 minutes. or until a fork comes out clean in the center.
Remove the quiche from the oven and let it sit for about 10 minutes before slicing and serving.
Notes
Crust: If you want a homemade crust, use the exact same one from my asparagus quiche recipe.
Tips: See my recipe tips above for making the best cottage cheese quiche.
Leftovers: Keep in the fridge, covered, for up to three days, or in the freezer for two months.