Cauliflower rice - Pulse florets in a food processor until broken up into ‘rice’-sized bits. Cook rice in one of two ways: 1) Microwave for 4 to 5 minutes and then fold in butter. Season with some salt and pepper; or 2) Heat a pan over medium-high heat and add butter. Saute cauliflower in heated butter for ~5 minutes, until tender but still crunchy. Season to taste with some salt and pepper. Watch this video for the full how-to on cauliflower rice. (Can be done up to 5 days ahead)
Steam broccoli - Chop broccoli. Place broccoli in a microwave-safe bowl. Cover with a damp paper towel and cook on high until tender, ~3 minutes. (Can be done up to 5 days ahead)
Make sauce - Whisk together aminos, honey, tomato paste, vinegar, chili garlic sauce, and toasted sesame oil. (Can be done up to 5 days ahead)
Chives - Chop chives. (Can be done 1 day ahead)
Chicken - Cube chicken. Tenderize with a fork and season with some salt and pepper. Toss chicken in arrowroot powder until completely coated. (Can be done 1 day ahead)
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Heat a wok or skillet with cooking oil over medium-high heat.
Add chicken to heated pan and cook on one side until golden brown. Flip and cook until golden on all sides, ~4 minutes total (it shouldn’t be cooked all the way through).
Pour sauce over chicken, scraping up any browned bits on the bottom of the pan. Add broccoli and sesame seeds. Stir everything together until coated in sauce, 2 to 3 minutes more.
If cauliflower rice was made ahead, reheat in the microwave.
Serve sesame chicken over cauliflower rice with chives on top. Enjoy!