In a medium saucepan, combine rinsed quinoa and water. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes or until water is absorbed. Fluff with a fork and set aside.
Heat olive oil in a large skillet over medium-high heat. Add the ground turkey to the pan.
Cook the turkey for 8 to 10 minutes, breaking it into small crumbles with a spatula, until fully browned and cooked through to an internal temperature of 165°F.
Stir the dried oregano, garlic powder, salt, and black pepper into the turkey. Cook for an additional 1 minute to toast the spices, then remove from heat.
Prepare the fresh vegetables by dicing the cucumber, halving the tomatoes, and thinly slicing the red onion.
Assemble the bowls by dividing the cooked quinoa into four equal portions. Top each portion with the seasoned ground turkey.
Add the prepared cucumber, tomatoes, red onion, and kalamata olives to each bowl.
Finish each bowl with a tablespoon of crumbled feta cheese, a dollop of tzatziki sauce, and a sprinkle of fresh parsley.