Preheat oven to 350°. Wash/rinse tomatoes and jalapeno. Also if pie crust is frozen be sure to defrost so you can easily unfold and ready to use once prepping veggies.
Slice tomatoes, jalapeno, red onion and set aside. Then chop cilantro, peel the garlic cloves or leave as is if you have a garlic press.
In a saute plan over medium heat 2 tablespoons of olive oil. When oil is hot add the red onions and season with a pinch of salt and pepper. Cook until the onions are soft and a little caramelized, about 5-7 min. Towards the end of cooking, add the crushed garlic and stir. Set aside when done.
Lay the pie crust down on a non-stick cookie sheet or a lightly oiled cast iron skillet. Begin layering first the tomatoes in a circular pattern making sure to leave about 2-3 inches away from dough edges until bottom is covered. Season tomatoes with a pinch of salt & pepper and drizzle with 1-2 tablespoons of olive oil. Top with the jalapeno slices and sprinkle crumbled cheese evenly on top. Top with chopped cilantro, oregano and finally, the sauteed onions.
Fold over the edges while turning galette and pinch dough as you go along. You should have about a 4-5 inch opening in center.
Bake galette for 30-35 minutes but check towards end of cooking to account for different oven types. Remove from oven when dough is a light brown color and let cool for a few minutes before serving.
Notes
If you want a spicier galette, use habanero peppers or add more jalapenos. One large jalapeno made gave it a mild level heat. Don't have Mexican Cotija cheese? Substitute a mild white cheese like goat cheese or mild white cheddar.