Preheat your oven to 400°F and line a large baking sheet with parchment paper.
In a mixing bowl, roughly mash the canned chickpeas with a fork until they are broken down but still have some chunky texture.
Add the cooked quinoa, liquid egg whites, nutritional yeast, hemp hearts, and finely chopped fresh spinach to the bowl.
Stir in the garlic powder, onion powder, and half of the sea salt and black pepper until the mixture is cohesive.
Scoop the mixture into small balls, place them on the baking sheet, and press down slightly to form thick discs.
Bake for 20 to 25 minutes, flipping the bites halfway through, until they are golden brown and crispy on the edges.
While the bites are roasting, whisk together the nonfat Greek yogurt, lemon juice, and the remaining sea salt and black pepper in a small bowl.
Remove the bites from the oven and serve them immediately with the lemon-yogurt dipping sauce.