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1
Add oil and butter to a large skillet over medium-high heat.
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2
Add onions and cook for about 5 minutes until onions soften and turn translucent.
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3
Reduce heat to medium-low, cover, and cook onions for about 20-25 minutes, stirring occasionally, until deep golden brown.
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4
Add cubed sweet potatoes and spinach to skillet.
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5
Cook for 3-4 minutes until spinach is wilted.
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6
Remove from heat and set aside to cool.
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7
Preheat oven to 325 degrees F.
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8
In a large mixing bowl whisk together eggs, milk, cream, salt, pepper, and herbs.
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9
In a small bowl combine the cheeses with the flour, tossing until combined, then put cheese/flour mixture into the large bowl with the egg mixture; also add the onion and sweet potato mixture (make sure it has cooled enough to not scramble the eggs, slightly warmer than room temperature).
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10
Stir everything together until combined, then pour into the pre-baked pie crust.
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11
Bake for about 40 minutes or until a knife inserted into the quiche comes out clean and it doesnt jiggle when you nudge the pan.
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12
Note: Click over to the related blog post to see the no-roll pie crust I used with this quiche.
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13
Its whole-grain and shortening-free!