Oh, kale, I think I'm developing a crush on you. It must be serious, because now I'm enjoying your company first thing in the morning (and for the most part, I just like to sit and stare into my coffee mug at breakfast time). You must be something special. This breakfast casserole (which I also like to serve for lunch) with kale, mushrooms and caramelized onions comes together in 20 minutes and bakes for an additional 35, giving me time to whip up some mini muffins and fresh-squeezed orange juice, or a salad and crusty bread toasts. The slowly sautéed onions lend their sweetness to balance the bitter greens, and that's the flavor that makes this breakfast casserole a winner. Mushrooms and red pepper are one of my favorite combinations but not essential to the dish, so when you make this -- and you will, if you're falling in love with kale like I am -- substitute with any vegetables you have on hand.