Pat the chicken breast dry with paper towels and season both sides with sea salt, black pepper, and half of the dried oregano.
Heat 0.5 tablespoon of olive oil in a large skillet over medium-high heat and sear the chicken for 6-7 minutes per side until golden and cooked through.
Remove the chicken from the skillet and set aside to rest.
In the same skillet, add the remaining 0.5 tablespoon of olive oil along with the rinsed chickpeas and minced garlic.
Sauté the chickpeas for 5-8 minutes, stirring occasionally, until they become golden and slightly crispy on the outside.
Stir in the lemon zest, lemon juice, and the remaining dried oregano, scraping up any browned bits from the pan.
Add the baby spinach to the skillet and toss for 1 minute until just wilted.
Slice the rested chicken breast and serve it over the warm, zesty chickpea and spinach mixture.