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In a pot, add the yellow and zucchini squash, onion and carrot. Cover with water and bring to a boil, cooking for 6 minutes. Drain well.
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Mash the veggie mixture (I used an my immersion blender for this) then stir in the remaining ingredients.
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Once combined, pour into a 1.5 quart, lightly greased, casserole dish.
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Bake in a 350 degree oven for 25-30 minutes or until the top begins to brown.