Before assembling the sandwich, we need to prepare the ingredients.
Chicken: ideally, fresh grilled chicken breast is the best for this recipe. I grill mine in a Ninja Foodi Grill for 9-11 minutes (or until internal temperature is 165 degrees F). Rotisserie chicken or frozen chicken breast strips / tenders can be used too.
Onions: Heat the griddle to medium heat and grease. Add a sliced white vidalia onion to the skillet and sautee them until caramelized & brown (roughly 6-8 minutes).
After the onions are almost done cooking, heat the griddle to 300 degrees F and grease completely. We're going to warm all the ingredients before assembling the sandwich. This ensures that each bite is consistent and warm. Add sliced apples, chopped goat cheese, and diced spinach to the grill. Lightly grease each side of the bread and place on the griddle as well.
After about 2-3 minutes and the ingredients are getting warm, spread the honey mustard onto one side of the sandwich. Then add vadalia onions and sliced apples on top of the mustard.On the other slice of the bread, smear blueberry goat cheese around. Sprinkle diced spinach on top of the goat cheese.
Add the sliced grilled chicken onto the apple/onion/mustard slice of bread. Drizzle desired amount of honey on top.
Fold together each slice of bread together, forming an incredibly tasty looking sandwich.
If needed, grill for another 1-2 minutes on each side. Usually, by this time, the bread has been toasted on the griddle while layering on ingredients. Since all of the ingredients are already warm, this allows you to enjoy the sandwich immediately & avoid getting a hot/cold grilled sandwich.