Frittatas can make an easy grain-free and paleo-friendly breakfast or dinner in this case. Even though today's recipe uses mushrooms and sausage, feel free to try whatever combination you like best.
Heat up an oven-safe pan like a skillet over medium heat. Add in coconut (or cooking) oil and then onions to heated oil with a dash of salt. Saute for about 3 to 5 minutes, until softened. Next add in mushrooms, sausage, and romesco sauce and cook for another 3 to 5 minutes, to let mushrooms soften.
Pour in eggs and then top with green onions. Bake for 15 to 20 minutes until a knife comes out clean.
While frittata is cooking, whisk together garlic, Dijon, vinegar, and olive oil. Season to taste with salt and pepper.
Toss with mixed greens and serve with frittata. Drizzle with more romesco sauce if you want (and have some left).