Cook Chicken:
Heat olive oil in a large skillet over medium-high heat. Add chicken pieces and cook until browned and cooked through, about 6–7 minutes. Remove chicken from skillet and set aside.

Sauté Garlic and Broccoli:
In the same skillet, add minced garlic and sauté for 1 minute until fragrant. Add broccoli florets and cook for 4–5 minutes until tender-crisp.

Add Spinach and Sauce:
Add spinach, chicken broth, soy sauce, and crushed red pepper flakes (if using). Stir until spinach wilts and sauce slightly reduces, about 2 minutes.

Combine and Season:
Return chicken to the skillet and toss everything together. Season with salt and pepper to taste.

Serve:
Serve warm as a healthy main dish or over rice or noodles.