On 6-quart Instant Pot™, select SAUTE; adjust to normal. Melt 2 tablespoons of the butter in insert. Add shallots and garlic; cook 1 minute, stirring constantly. Add mushrooms, salt and pepper flakes; cook 4 to 5 minutes or until mushrooms are softened. Add rice; stir about 1 minute or until rice is coated. Select CANCEL.