Cream together toasted mini marshmallows, butter, oil, sugar, and marshmallow crème in a large bowl with an electric mixer until thoroughly incorporated and smooth, 2 to 3 minutes. Beat in egg whites, 1 at a time, mixing well after each addition. Mix in vanilla and almond extracts. Stir in half of the flour mixture until just combined. Mix in buttermilk until just combined. Stir in remaining flour mixture until just combined.