Preheat oven to 350 degrees and prepare premade pie crust per directions

In a medium skilled heat up the tablespoon of olive oil

Add onions to skillet and cook until just translucent

Add spinach to the onions and saute until just cooked and wilted, remove from heat and allow to cool

In a large bowl scramble eggs and mix in sweetened condensed milk

Once spinach is cool, mix in cheeses and put into the prepared pie crust

Pour the egg mixture over the spinach mixture into the pie crust and adjust lightly with fork or spoon as needed to ensure spinach and cheese are evenly distributed

Bake in the oven for 40-45 minutes or until just set and slightly golden on top

If the crust begins to get too dark you can cover the edges with a bit of foil to prevent over-baking

Once baked allow to cool, slice and serve!