01 -
Set the oven temperature to 400°F to prepare for toasting the buns.
02 -
Place lean ground chicken in a large sauté pan over medium-high heat and break into small pieces while cooking.
03 -
Add diced yellow onion to the pan and combine with the chicken while sautéing.
04 -
Once chicken is fully cooked, stir in marinara sauce, basil pesto, salt, and pepper until the mixture is evenly coated.
05 -
Reduce heat to low, add shredded Parmesan cheese to the mixture, and stir thoroughly. Let simmer gently while preparing the buns.
06 -
Arrange brioche buns in a single layer on a baking sheet, spread each with garlic margarine or butter, and toast in the preheated oven for 5 minutes.
07 -
Spoon the chicken mixture onto the bottom halves of the toasted buns, sprinkle with shredded mozzarella cheese, and cover with the top halves.
08 -
Plate the sandwiches and serve immediately while hot.