I am not in Texas, Here the Mexican Food Places use a Mexican cheese, and it is white. Some places use a mix of cheeses, cheddar and the white Mexican Cheese. The White cheese stays soft and not stringy.
It is quite good. Con Queso I believe is the name or the brand...I don't buy it at our Grocery stores but having worked there I know it is common.
Look for the Mexican Cheese you will like it much better.
Sounds easy enough to make with the right ingredients.
Tortillas....warmed or lightly placed in a pan with hot oil then onto a paper towel to absorb any of the leftover oil. Keep warm until you get the needed amount. (Wrap in a bath towel very will and they stay warm for awhile)
The Cheese....have it ready
Onions ..........have them chopped..(Green onions are good mixed with the regular brown skinned onions)
I would think the chili con queso sauce could be bought in a can or something close that will suffice.
After the tortillas are done, place on a plate, add the cheese and a good sprinkling of the chopped onions. I like to salt and pepper that, but that is up to you) Start rolling them up, and place in a baking pan.
When done, put the sauce on the top and bake them for about 30 minutes....serve with Refried Beans and Rice....
enjoy....