First blanch the green beans by boiling them until they turn a bright green (about 1 minute) then shock with a bowl of ice water. Drain and set aside.
In a bowl, whisk together the dijon mustard, tahini, nutritional yeast, water, garlic powder, chili flakes, and sea salt until smooth and combined. Set aside.
Preheat a large pan over medium with the olive oil and coconut oil. Add the green beans and drizzle the sauce on top. Quickly stir and mix beans until they're coated, cook until the beans are hot and remove from pan immediately (you should be sautéing them for 3-5 minutes or else they'll get overcooked and soggy).
Serve immediately, and enjoy!