Combine first 5 ingredients in container of an electric blender or food processor, and process until smooth.
Set mixture aside.
Fry tortillas, one at a time, in 1/4 inch of hot oil about 5 seconds on each side or until softened.
Drain tortillas well on paper towels.
Spoon 1 tablespoon each of cheese and onion on each tortilla; roll up and place in a lightly greased 12- x 8- x 2-inch baking dish.
Spoon spinach mixture over tortillas.
Sprinkle with remaining cheese.
Bake, uncovered, at 325Â° for 30 minutes.