Easy 15-Minute Ranch Chicken and Vegetable Skillet

olive oil

about 1 1/4 pounds boneless skinless chicken breasts, diced into bite-sized pieces

about 2 cups broccoli, cut into bite-sized pieces (I use florets and stalks)

zucchini, diced in 1/4-inch pieces

packet Hidden Valley® Original Ranch® Salad Dressing & Seasoning Mix

lemon juice

about 2 cups fresh spinach leaves, cut into bite-sized pieces if necessary (2 big handfuls)