Our frittatas have been some of our members' favorite type of meal (maybe because no one has time for breakfast anymore?). Smarts: Make two, freeze, and have it leftover for Thanksgiving weekend.
Make dressing - If prepping at dinner, get your frittata in the oven before returning to this step. Whisk vinegar, mustard, syrup, and cooking oil. Season to taste with salt and pepper. (Can be done up to 3 days ahead)
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Heat up a skillet over medium heat. Add in cooking oil and then onions to heated oil with a dash of salt. Saute for about ~5 minutes, until softened. Next add in mushrooms and chard stems, and cook for another 3 to 5 minutes, to let mushrooms soften.
Add in chard leaves and toss through to let the heat wilt the chard. Pour in egg mixture and layer in sausage. Stir to mix everything through and then transfer to oven. Cook for 18 to 22 minutes, until a knife comes out cleanly.
Toss dressing with mixed greens. Season to taste with more salt and pepper. Serve with your frittata!