1. Heat the olive oil in a large skillet over medium heat. You want the oil shimmering but not smoking.
2. Add the chopped onion and sauté for about 5 minutes until it becomes translucent and soft. This step builds flavor, so don’t rush it.
3. Stir in the minced garlic and cook for another 30 seconds until fragrant. I always remind myself here to breathe deeply—garlic smells like home.
4. Add the sliced mushrooms to the skillet. Cook for about 7-10 minutes, stirring occasionally, until the mushrooms release their moisture and start to brown. This is where that deep, earthy flavor develops.
5. Season with salt, pepper, and crushed red pepper flakes if you’re using them. The heat adds a nice contrast to the earthiness.
6. Once the mushrooms are browned, add the fresh spinach in batches, stirring to wilt it down. This should take about 3-4 minutes. Be patient—spinach cooks down a lot but adds so much color and nutrition.
7. Turn off the heat and stir in the butter and lemon juice. The butter adds a silky finish, and the lemon juice brightens up everything. I learned this trick from my mom who always said a little acid wakes up the flavors.
8. Sprinkle with Parmesan cheese and give it one last gentle stir. Serve immediately for the best texture and flavor.

Cooking this feels like a small, peaceful ritual that helps me unwind after the chaos of the day. Plus, my kids have gotten surprisingly good at helping with the stirring, which turns the kitchen into a little storytelling corner, just like when I was a kid.