Potato dumplings (gnocchi) are a hearty base for this one-pan meal with chard and browned mushrooms. Sprinkle a bit of feta on top for a savory finish.
While gnocchi cooks, heat a large skillet over medium heat. Add olive oil and then mushrooms and saute until mushrooms are dark golden brown, 5 to 6 minutes (don't rush this step - the mushrooms will develop more flavor the longer they cook). Add Italian seasoning and some salt and saute for 1 minute more.
Add butter and stir until melted. Stir in shallots and chard stems and saute until shallots are soft, 2 to 3 minutes.
Pour stock over mushrooms and stir in chard leaves. Simmer for 1 minute, until chard leaves are tender.
Remove from heat and stir in gnocchi and lemon juice. Season with some salt.