Season the Chicken: Pat the chicken breasts dry with paper towels and place them on a cutting board. In a small bowl, combine paprika, garlic powder, black pepper, and salt. Rub this seasoning mixture evenly over both sides of each chicken breast.
Oil and Preheat: Brush both sides of the seasoned chicken with olive oil. Preheat your grill or grill pan to medium-high heat, about 400 to 450 degrees Fahrenheit, for 5 minutes.
Grill the Chicken: Place the chicken breasts on the hot grill and cook for 6 to 7 minutes on the first side without moving them. Flip and cook for another 6 to 7 minutes on the second side until the internal temperature reaches 165 degrees Fahrenheit.
Rest and Slice: Remove the chicken from the grill and let it rest for 5 minutes on a cutting board. Slice into bite-sized strips or chunks for easy salad assembly.
Prepare the Vegetables: While the chicken cooks, chop the romaine lettuce into bite-sized pieces, slice the cucumber, and halve the cherry tomatoes. Arrange on your serving plates or in a large mixing bowl.
Make the Dressing: Whisk together olive oil, lemon juice, and Dijon mustard in a small bowl. Season with a pinch of salt and pepper to taste.
Start with Lettuce: Divide the chopped romaine lettuce evenly among your serving plates or bowls.
Layer the Vegetables: Arrange the sliced cucumber, halved cherry tomatoes, and any other optional vegetables on top of the lettuce.
Add the Proteins: Place the warm sliced chicken and hard-boiled egg slices on top of the vegetables.
Dress and Season: Drizzle with the lemon dressing and season with salt and pepper to taste. Toss gently or serve dressing on the side if preferred.