Can this be made in under 30 minutes?

Yes, the recipe is designed to be quick and efficient.

Does it work for meal prep?

Most versions store well for one to three days.

Yes, simple swaps can be made for convenience or dietary needs.

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Preheat a grill or skillet over medium heat. Season the chicken breasts with salt and pepper.
Add olive oil to the grill or skillet and cook the chicken breasts for about 6-7 minutes on each side, or until fully cooked.
Remove from heat and let rest for a few minutes before slicing thinly.
In a bowl, mash the avocados with a fork and mix in lime juice. Season with salt and pepper.
Spread mayonnaise on one side of each slice of sourdough bread.
Lay out two slices of bread, mayonnaise side down. Layer each with the sliced chicken, avocado mixture, a slice of Swiss cheese, tomato slices, red onion, and spinach leaves.
Top with the remaining slices of bread, mayonnaise side up.
Melt a bit of butter in the grill or skillet over medium heat. Place sandwiches in, pressing down slightly with a spatula.
Grill until the bread is golden brown and the cheese is melted, about 3-4 minutes on each side.
Remove from heat, slice in half, and serve immediately.

For quick assembly, consider using pre-cooked rotisserie chicken. Store leftover components separately for best texture.