Place chicken breasts in a large bowl, Tupperware, or resealable bag. Drizzle with olive oil, Kosher salt, dried oregano, garlic powder, and black pepper. Use your hands to thoroughly mix.
When ready, heat a grill over medium-high heat. Coat the grates with nonstick grill spray, then carefully add chicken breasts, allowing any excess oil and marinade to drip off before placing on the grill. Cook. Transfer to a cutting board, then rest before slicing.
Place Little Leaf Farms Baby Crispy Green Leaf Lettuce on a large serving plate, then scatter with halved tomatoes, thinly sliced cucumbers and pickled red onions. Toss with our Creamy Garlic Dressing or serve with the dressing on the side. Sprinkle with chopped tarragon and a sprinkle of flaky sea salt!