No BBQ sauce lol but I have had BBQ spaghetti from a good friend and it was pretty good.
Texas Spaghetti is basically a baked spaghetti. Didn't realize it was a thing until joined the military and left Texas and started cooking it for others. What was normal to me growing up in Texas was different for others not from tha Long Star State.
Layered in a baking pan kinda like you would do Lasagna. Layer the cooked spaghetti first ( I typically use eggs to keep the spaghetti together ). Then you follow that up with your sauce ( combination of your favorite spaghetti sauce, chopped onions & peppers, mushrooms, Italian sausage or ground beef and seasonings ). Then top it off with a combination of cheeses.
I usually cook my spaghetti sauce in a crockpot for about 6 hours.