Prep all ingredients as listed above.
Toast the bread slices.
Spread mayonnaise on one side of each slice of toasted bread.
Layer with arugula, baby spinach, tomato slices, deli turkey, provolone cheese, cucumber, red onion, pepperoncini, and avocado.
Drizzle the layered ingredients with olive oil, and sprinkle with salt, black pepper, and oregano for added flavor.
Top each sandwich with the remaining slices of bread, mayonnaise side down. Press gently and slice each sandwich in half.
To make the chia fresca, stir all the ingredients together. Let sit for 5 minutes for the chia seeds to bloom.
Serve the sandwich with carrot, hummus, and chia fresca.