Prepare the Meatballs (Prep-Ahead Step): In a medium bowl, combine the ground chicken, no-salt-added breadcrumbs, onion powder, garlic powder, and black pepper. Mix gently with your hands until just combined. Roll the mixture into 12 small meatballs. Cook in a non-stick skillet over medium heat, turning occasionally, until browned and cooked through (165°F / 74°C), about 8-10 minutes. Allow to cool completely. This can be done up to 3 days in advance.
Make the Yogurt-Dill Spread: In a small bowl, combine the non-fat Greek yogurt, fresh lemon juice, ¼ tsp black pepper, ⅛ tsp garlic powder, and chopped fresh dill. Stir until smooth.
Assemble the Wraps: Thinly slice the cooled meatballs. Lay the four tortillas flat. Briefly warm them for 10-15 seconds in a dry skillet or microwave to make them more pliable.
Layer the Ingredients: Spread the yogurt-dill sauce evenly over each tortilla, leaving a ½-inch (1.25 cm) border. Top with a layer of baby spinach, followed by the sliced meatballs, grated cucumber, and diced red bell pepper.
Roll and Pack: Starting from the edge closest to you, roll each tortilla tightly into a log. Slice each wrap in half on a diagonal. Arrange the wraps in lunch containers with ½ cup of cucumber spears and ¼ cup of grapes on the side.