Start your pasta to boil and your diced bacon to cook according to package directions, they take approximately the same amount of time.
Once your pasta has cooked drain and set aside. When bacon is cooked remove from the pan and reserve 1 tsp. of the bacon grease in the pan.
In the same pan melt 1 Tbs. butter in the bottom then add onions and zucchini. Soften for around 3 minutes. Add tomatoes. Sautee quickly.
Over the top of the vegetables sprinkle the flour and stir. Pour in milk. Bring to a simmer and Parmesan cheese, Italian cheese, garlic powder and pepper. Let thicken, which should take about 2-3 minutes.