How to Make 'Pastagna'

Ingredients:
3 Tbsp extra virgin olive oil;
3 cloves garlic;
4 tomatoes, diced;
2 cups spaghetti sauce;
3 Tbsp chopped fresh basil;
2 Tbsp butter
2 Tbsp flour
2 cups milk
dash nutmeg;
1 package ziti, bowtie or any other pasta;
Salt and pepper.