Greek Pastitsio Bake

Name: Greek Pastitsio Bake
Ingredients: 1 pound ground lamb; 1 pound ground beef; 2 tablespoons olive oil; 1 yellow onion diced; 1 red bell pepper diced; 3 cloves garlic minced; 15 ounces tomato sauce; 1/4 cup tomato paste; 1 teaspoon kosher salt; 1/2 teaspoon coarse ground black pepper; 1/4 teaspoon cinnamon; 1 bay leaf; 1 pound penne pasta cooked, not rinsed; 8 tablespoons unsalted butter; 1/2 cup flour; 3 cups whole milk; 1/4 teaspoon coarse ground black pepper; 2 large eggs; 1 cup parmesan cheese