What you see here is an excellent, hearty, winter-spirited casserole. It’s simple to pull together, and once in the oven the smell of garlic and herbs baking alongside the heirloom beans, simmering tomatoes, and golden mushrooms will bring neighbors in off the sidewalk. You should make it a.s.a.p!
I found the recipe deep in back of Rancho Gordo Vegetarian Kitchen cookbook - (Rancho Gordo forever around here). The technique for cooking the mushrooms is part of what caught my attention. You cook the mushrooms in quite a bit of liquid and then allow them to cook in the residual fat (olive oil) after the liquid evaporates. The technique is like carnitas, the classic Mexican pork dish. Hence the recipe title. But, of course, unlike the traditional preparation, cooking this with mushrooms makes it a vegetarian casserole. 
Choosing the Right Beans
The recipe falls into the Dark & Hearty Beans chapter of the book, and Eye of the Goat beans, or other brown beans are what's recommended. That said, many, many types of beans could work here. I went a bit rogue and used some beautiful Rancho Gordo Yellow Eye Beans. They're creamy, melty, and mild. They took on the bubbling casserole juices beautifully. I also love the way those beans in particular hold their markings. Beyond those suggestions, I imagine using any creamy white bean would be nice here too - for example, the Alubia Blanca, or Marcella. And, if you only have canned beans on hand - it's ok! Drain them, rinse them, use them!
Cooking the Mushrooms
I just wanted to leave a visual reference here. This is how the mushrooms looked (above) when I take them off the heat. And now that I'm looking, I could have even gone a bit longer. Do you see how there's nice browning on the edges? That's what you're after. Then, you add all the other ingredients to the same pan (below), give it all a good stir, add a bit of cheese and pop it in the oven. I’ve tweaked the original recipe a bit to allow you to go from stovetop to oven in one skillet (reflected below), and bumped the quantity up by half, because this casserole is popular and goes fast.
Variations
Here are a couple ways you might build on this idea!
- With Breadcrumbs: Toss 1 cup of chunky breadcrumbs with a glut of olive oil and sprinkle across the top of the bean mixture before baking.
- Breakfast Casserole: Make three divots in the bean-mushroom mixture prior to baking, crack an egg into each of the depressions & bake until eggs are set, and bean mixture is bubbling.
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