Step 1

Preheat oven to 350 degrees F. Coat a rimmed baking sheet with cooking spray.

Step 2

Heat oil in a large skillet over medium-high heat. Add sweet potato and shallots and cook, stirring occasionally, for 3 minutes. Add bell pepper and zucchini; cook, stirring, until the vegetables are starting to soften, 2 to 3 minutes. Add corn, peas and garlic; cook, stirring, for 2 minutes more. Stir in salt and pepper. Turn the mixture onto a plate and cool for 10 minutes.

Step 3

Whisk eggs in a large bowl; whisk in milk, breadcrumbs, parsley, Worcestershire, thyme and cayenne. Stir in the cooled vegetables. Add turkey and gently but thoroughly mix with your hands or a spoon to combine. Shape the mixture into two loaves (about 6 by 3 inches each) on the prepared baking sheet. Brush the top of each loaf with half the ketchup.

Step 4

Bake until an instant-read thermometer inserted into the center registers at least 160 degrees F, about 40 minutes. Let stand for 15 minutes before slicing.