In a skillet over medium-high heat, stir together beef, Tex-Mex spice mix and water.
Cook just until meat is heated through and turn off heat.
Heat flour tortillas for about a minute in the microwave to soften them up.
On the center of each tortilla, spoon about 2 tablespoons of meat and about 1 tablespoon cheese and roll up, folding sides in to form a closed roll. Secure with a wooden pick.
Heat vegetable oil to 350 degrees and fry chimichangas a few at a time, placing seam side down first, in oil.
Watch chimichangas carefully, turning as they start to brown. It will only take a few minutes per side.
When they are browned on all sides, remove to paper towel lined plate to drain.
Serve with shredded lettuce, green onions, sour cream and salsa.