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Step 1
Preheat oven to 425˚F. Grease 9-inch square baking dish with half of the butter. Arrange onion slices in bottom of baking dish.
Step 2
In bowl, whisk together 2 tbsp cream and flour until smooth. Whisk in remaining cream and Seasoned Vegetable Base; pour over onions.
Step 3
Sprinkle Cheddar and Parmesan over top. In large bowl, using fingertips, cut remaining butter into bread crumbs. Sprinkle evenly over top.
Step 4
Cover with foil; bake for 20 minutes. Remove foil; bake for 10 to 15 minutes or until bubbling and golden brown on top.