Chop the onion, peppers, and broccoli into small pieces.
Fry the onion and vegetables in a large frying pan, adding salt, pepper, and oregano.
Add in the ground beef, and fry until the beef is well-cooked.
Chop the tomatoes, and add, along with the spaghetti sauce.
Continue to simmer 20-30 minutes, until the liquid has mostly boiled off. It should not be at all runny, or else the end product will be very messy.
Now brush one side of a tortilla with olive oil, and fry for a couple minutes, oil side down; remove.
Then take another tortilla, brush it with olive oil, and place on frying pan. Sprinkle half the cheese and sour cream evenly (not too close to the sides), and then spread half the sauce and rice, again not too close to the edge, about 1/4-1/2" thick.
Place the already baked tortilla on top, and fry for a few minutes.
Remove, cut into quarters, and do the same for the other two tortillas.