Heat grill on medium to medium-high heat. Alternatively, a grill pan may be used on the stove. Drizzle chicken breasts with oil then sprinkle with desired amount of roasted garlic and herb seasoning. Grill turning halfway through cooking. Grill until cooked through with no pink and the internal temperature is 165°F. Slice and place on prepared salad. While the chicken is grilling make the vinaigrette. In a food processor add oil, strawberries, vinegar, mustard, garlic, salt, and pepper. Pulse until smooth.
To a large salad bowl, add spinach, sliced strawberries, sliced avocado, crumbled goat cheese, pecans, and grilled sliced chicken. Drizzle salad with vinaigrette and serve.
Store leftover salad in an airtight container in the refrigerator for up to 4 days. Store dressing in a seperate airtight container or mason jar in the refrigerator for a week.