1 3/4lbssweet potatoespeeled and cut into 1-inch pieces
3Tbsp olive oil
1/3cup maple syrupmore or less to taste
1tsp saltdivided
1/4tspnutmeg
1/2tspcinnamon
4largeeggsSeparate the whites from the yolks. Reserve 2 yolks for another use.
1Tbsporange zest
3Tbspfresh squeezed orange juice
1/2cup toasted pecanschopped, divided (plus extra pecan halves for garnish if desired)
Instructions
Boil sweet potatoes with 1/2 tsp salt, for about 15 minutes or until tender. Drain well in a colander. Set the sweet potatoes aside to cool for at least 10 minutes.
Preheat oven to 350°F. Lightly spray a 2-quart casserole dish.
While the sweet potatoes cool, whip the egg whites for about 8 minutes or until they form stiff peaks. Set them in the refrigerator. They'll hold for at least 30 minutes if needed.
Transfer the sweet potatoes to a large mixing bowl and whip them with a mixer for about 30 seconds or until they are completely smooth.
Add the olive oil, maple syrup, remaining 1/2 tsp salt, nutmeg, cinnamon, egg yolks, orange zest and juice, and half the pecans to the potatoes and mix for another 30 seconds with the mixer.
Gently fold in beaten egg whites until no white streaks are visible but don't over-mix.
Place mixture in the casserole dish and sprinkle with the remaining chopped pecans.
Bake for 30 minutes. Serve immediately.
Notes
If desired, reserve a few whole pecans for the top of the casserole. The souffle will deflate once it cools, so serve it soon after you remove it from the oven.To prepare this a day ahead, make the whipped sweet potato mixture, but don't add any eggs. Remove it from the refrigerator the next day, let it come to room temperature, and add the beaten egg yolks to the sweet potato mixture, whip and fold in the egg whites, and bake.Store leftovers for up to 3 days in the refrigerator.