Season the chicken thighs with dried oregano, paprika, salt, and red pepper flakes.
Heat a high-sided heavy-bottomed skillet over medium heat for 2 minutes.
Add 2 tablespoons olive oil and the chicken thighs, cooking undisturbed on medium heat for 5 minutes.
Flip chicken, reduce heat to low-medium, and cook 5 more minutes until internal temperature reaches 165°F (74°C).
Remove chicken from skillet.
Add half of the grape tomatoes, garlic, dried oregano, salt, and 1 tablespoon olive oil to the skillet; cook 2 minutes until tomatoes soften.
Stir in chopped spinach until wilted.
Add cooked rice and drained chickpeas.
Add lemon juice and remaining grape tomatoes; reheat while stirring. Add extra olive oil if desired.
In a bowl, combine diced feta with extra virgin olive oil, lemon juice, dried oregano, and fresh oregano; mix well.
Mix half of the feta mixture into the rice skillet.
Slice the cooked chicken and add to the rice; reheat on medium heat.
Top with remaining feta mixture and fresh oregano.
Season with salt and black pepper to taste.