Prep all produce and cut the poultry into bite-sized pieces.

Melt butter in a large skillet or wok over medium-high heat.

Add the meat to the pan, seasoning lightly with salt and pepper. Sear until golden brown and cooked through, about 5-7 minutes. Remove the meat and set aside.

Add the broccoli florets, sliced carrots, halved mushrooms, and chopped yellow onion to the hot skillet. Stir-fry for 5 minutes until tender-crisp.

Return the cooked meat to the skillet with the vegetables. Stir in the soy sauce and sesame oil. Cook for an additional 2 minutes until everything is evenly coated and heated through.

Garnish with sliced green onions and serve hot, accompanied by Yum Yum sauce for drizzling or dipping.