Puréed carrots get the company-best treatment with a little butter, sugar, and maple flavoring. You'll love the soufflé-like texture. An Instant Pot and a food processor make assembly quick and easy, but neither is essential. Make it gluten-free by using gluten-free flour.
Steam carrots: Steam 1 pound scrubbed carrots (cut in 1/2 to 3/4 inch chunks) in an Instant Pot (5 minutes, natural release) or on the stovetop until tender.
Purée: Process carrots in a food processor or mixer until smooth.
Add remaining ingredients: Blend in 3 tablespoons all-purpose flour, ⅓ cup granulated sugar, 1 teaspoon table or sea salt, 1/2 teaspoon maple (or vanilla extract), 3 large eggs, and ¼ cup butter, cut in chunks, and mix until smooth. Alternatively, use a stand mixer or immersion blender for this step.
Bake: Pour into a medium oven-safe buttered casserole dish. Bake at 400˚F (200˚C) for 15 minutes. Reduce heat to 350˚F (180C) and continue baking for 45 minutes more, until set.
Serve immediately.
Notes
Make ahead:
Prepare the casserole up to one day in advance. Cover and refrigerate before baking. Bring to room temperature, then bake as directed.
Or, freeze prepared casserole before baking. Thaw overnight in the refrigerator and bake as directed.