Preheat oven to 350 degrees F. Generously grease bottom only of a 13 x 9-inch pan.
Sprinkle at least 1 cup of the marshmallows evenly over bottom of pan.
Thoroughly combine thawed strawberries and syrup with gelatin; set aside.
In large mixing bowl, combine remaining ingredients. Blend on low speed until moistened; beat for 3 minutes at medium speed. Pour batter evenly over marshmallows in pan. Spoon strawberry mixture over batter. Bake for 45 to 50 minutes or until golden brown and a wooden pick inserted in center comes out clean.
Serve warm or cold with ice cream or whipped cream.