Cook in advance this breakfast tart to be free on the day.
Preheat oven to 350°F.
Place cooked crumbled sausage in a large mixing bowl. Fold in both cheeses.
Place one pie shell in a pie plate. Place half the sausage mixture in the pie shell.
Place the other pie shell in a pie plate. Pour rest of the sausage mixture in the shell.
Whisk eggs, milk, onion and both peppers in a separate bowl, making sure eggs are blended in well.
Pour half the egg mixture over the first pie shell and mixture. Pour the rest of the egg mixture over the other pie shell.
Bake one hour or until knife inserted in the middle comes out clean.
Let stand 10 minutes before cutting and serving.