Heat oil in a large non-stick skillet over medium heat, about 2-3 minutes
Once the oil is hot, add the onion and garlic, stirring occasionally. You want the onion to just start to turn translucent, avoid allowing the onion or garlic to brown, about 1-2 minutes
Add the squash blossoms, stir to mix with the onion and garlic. Reduce heat to medium-low and cover. Allow the blossoms to cook until the chalices are tender enough to pierce with a fork, about 10 minutes
Uncover and allow any excess liquid to cook off, if any remains in the pan. You want the filling to be moist, but not overly wet.
Stir in salt to taste and remove from the heat
Heat a comal or skillet over medium high heat
Place a tortilla on the comal and heat on one side until warmed through, about 30-60 seconds
Flip the tortilla and place 1/4 of the cheese on half of the tortilla and 1/4 of the squash blossoms on top of the cheese. Fold the empty side of the tortilla over the filling.
Heat until the cheese is melted, flipping over halfway through cooking, about 2 1/2 minutes per side.
Serve immediately