You can use the same weight of chicken breasts instead of chicken thighs. Many readers have used chicken breasts instead with much reported success. However, I would be careful of this kind of substitution because much depends on the thickness and weight of your chicken breasts. You may need to adjust cooking time. I find the recipe works beautifully (and quite frankly, tastes better!) using either the skin-on, bone-in chicken thighs or boneless, skinless chicken thighs, as stated in the recipe.