Pineapple Chicken Stir Fry

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2 tablespoons olive oil

2 tablespoons salted butter 

2 pounds boneless skinless chicken thighs, cubed into bite-size pieces 

1 green bell pepper, diced 

1 red bell pepper diced 

4 scallions, sliced, whites and greens divided 

2/3 cup low-sodium soy sauce 

2 tablespoons rice vinegar 

1 tablespoon cornstarch 

1 tablespoon grated fresh ginger 

2 teaspoons chile paste, plus more to taste 

2 cloves garlic, pressed 

One 20-ounce can diced pineapple, drained and juice reserved 

1/4 cup fried onions, such as French's

1/4 cup chopped peanuts 

1 tablespoon sesame seeds

1 teaspoon chile-lime seasoning, such as Tajin 

Cooked brown rice, for serving