Heat the olive oil and a tablespoon of butter in your wide pan over medium heat until shimmering and fragrant.
Add the finely chopped onion or shallot, cooking gently until translucent and soft, about 3 minutes. The aroma will be sweet and inviting.
Stir in the sliced mushrooms, sautéing until they release their juices and turn golden brown, about 5-7 minutes. The mushrooms should smell smoky and earthy.
Add the Arborio rice to the pan, stirring constantly for about 2 minutes until each grain is glossy and lightly toasted, releasing a nutty aroma.
Pour in the white wine, stirring until it mostly evaporates and the mixture lifts with a slight shimmer, about 2 minutes.
Begin adding the warm broth, one ladleful at a time, stirring gently and allowing each addition to be absorbed before adding the next. Continue this process, maintaining a gentle simmer, for about 18-20 minutes.
Test the rice; it should be tender but still have a slight bite, and the mixture should be creamy and velvety.
Remove from heat and stir in the remaining butter and grated Parmesan cheese until melted and well combined. Add salt, pepper, and a squeeze of lemon for brightness.
Finish with a sprinkle of chopped parsley and a touch of lemon zest for vibrant freshness. Let sit for 1-2 minutes to meld flavors.
Serve immediately, spooning the risotto into bowls, and enjoy the velvety, earthy flavors that evoke a peaceful forest walk.