Prep the chicken. Butterfly thick chicken breasts or pound them to an even 1/2-inch thickness.
This helps the chicken cook evenly and stay juicy.
Make the marinade. In a bowl, whisk olive oil, lemon juice, Dijon, garlic, honey, oregano, smoked paprika, salt, and pepper. Taste and adjust salt and acidity.
Marinate. Add chicken to the marinade and coat well. Let it sit for at least 20–30 minutes at room temperature or up to 4 hours in the fridge.
Preheat the grill or pan. Heat an outdoor grill to medium-high or a grill pan/skillet over medium-high.
Lightly oil the grates or pan to prevent sticking.
Grill the chicken. Cook chicken 4–6 minutes per side, depending on thickness, until the internal temperature reaches 165°F (74°C). Let it rest for 5 minutes before slicing.
Mix the dressing. Whisk olive oil, lemon juice or vinegar, Dijon, honey, salt, and pepper. The dressing should taste bright and slightly tangy.
Build the salad base. In a large bowl, combine greens, tomatoes, cucumber, and red onion.
Add half the dressing and toss gently to coat.
Slice the chicken. Cut the rested chicken into strips or bite-size pieces. This keeps the juices in and ensures tender slices.
Assemble. Top the dressed greens with chicken, avocado, cheese, and toasted nuts or seeds. Drizzle with the remaining dressing.
Finish and serve. Add a pinch of salt and pepper, maybe a squeeze of lemon, and serve right away while the chicken is still warm.