Follow the instructions for making Caramelized Mushrooms. You can make these up to a few days in advance and keep them in the fridge to save a lot of prep time when you want to assemble the toasts. If you have a cast iron skillet, use that for the recipe, since it also works well for toasting the bread.
While the mushrooms cook, make the ricotta spread. Mix together the ricotta cheese, garlic, lemon zest, red pepper flakes, salt, and pepper.
When the mushrooms are finished cooking, remove them from the skillet and set aside. Add a tiny bit of olive oil to the skillet and warm over medium heat. If you have long pieces of bread, cut them in half. Place the bread slices in the skillet, moving them around with your fingers to soak up a little of the olive oil in the skillet. Let them cook for about 2 minutes on each side until browned to your liking. Alternatively, you can use a toaster, but using a skillet means you don't have to drag it out!
Assemble the toasts. Spread the ricotta mixture on the sourdough. Spoon the mushrooms on top. Add thyme and flaky sea salt before serving if desired. Enjoy!
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Notes
The mushrooms and ricotta cheese mixture can be stored separately in the fridge for a few days if you want to make them ahead of time and assemble the toasts later.
Feel free to add additional protein like mashed beans or a fried egg.
You can use any bread that you like, but keep in mind that nutritional facts will vary. Some sourdough breads can be high in sodium, so that is why the sodium for this recipe was calculated to be around 800 mg per serving. The actual sodium will largely depend on what bread you use and how much flaky salt you add at the end. Opt for a lower sodium bread if you are watching your sodium intake.