1
: Preheat oven to 350ºF (180ºC).
2
: Heat oil in medium saucepan, add flour and cook over low heat stirring for 1-2 minutes. Whisk in milk. Bring to a boil, lower heat and cook for 5 minutes. Add Parmesan cheese, stirring until blended. Reserve.
3
: Toss cooked pasta with 1 ½ cups (375mL) tomato sauce.
4
: Spread ½ cup (125mL) tomato sauce on bottom of 9” x 9” (2.5L) baking dish. Place half the pasta mixture into dish, spread ¾ cup (175mL) reserved cheese sauce over pasta, ½ cup (125mL) tomato sauce and sprinkle with 1 cup (250mL) grated mozzarella cheese. Top with remainder of pasta mixture and repeat as above.
5
: Cover with foil and bake in preheated oven for 45 minutes. Remove foil last 5 minutes of baking. Let stand 10 minutes before serving.