Heat 2 tablespoons avocado oil in a large skillet over medium heat.
Add the chopped chicken thighs and cook until browned and much of the rendered liquid has evaporated, about 5–7 minutes.
Use a slotted spoon to transfer the chicken to a bowl and set aside.
Add the chopped green beans and matchstick red bell pepper to the skillet, stir, cover, and cook 3 minutes until vegetables are crisp-tender.
Return the chicken to the skillet and pour in 2/3 cup Paleo teriyaki sauce. Cover and cook 3 minutes to heat through.
Uncover and cook an additional 5–8 minutes, stirring occasionally, until the sauce has thickened and the chicken is cooked through; season with sea salt to taste.