Prepare sauce ingredients first by whisking together in a glass measuring cup.
Cook rice according to package and set aside.
Heat a large skillet over medium-high heat. Add 2tbsp olive oil, once hot, add chicken, break up and cook until no longer pink. Pour in 1/2 of the sauce and bring to a simmer, continuing to cook the chicken with the sauce until starts to thicken, about 7-8 minutes. Turn off heat. Remove chicken to a bowl.
In the same pan used for the chicken, add 1 tbsp more oil, add in peppers and onions. Cook for 3-4 minutes or until beginning to soften. Pour in almost all of the remainder of the sauce, saving about 2 tbsp left to mix with the cucumbers later. Toss peppers and onions in sauce and repeat same process with chicken, letting the sauce thicken over about 7-8 minutes. Turn off heat.
In a small bowl, mix together cucumbers and green onion and remaining sauce. Set aside.
Build your bowl! Start with rice on the bottom, add the teriyaki chicken, peppers and onions, and top with cucumber mixture and sesame seeds! Enjoy