Heat oven to 375 degrees.
In a large Dutch oven, heat oil over medium. Add onion and cook, stirring occasionally, until softened, about 3 minutes. Then add garlic and stir until fragrant, 1 minute. Next add rice, season with salt and pepper, and stir until combined and lightly toasted, 2 minutes.
Add kale, season with more salt and pepper, and stir until wilted, 30 seconds. Add broth and bring to a boil over high heat.
Once liquid is boiling, cover, place in 375-degree pre-heated oven, and bake with lid on until most of the liquid is absorbed and rice is tender, about 20 minutes (remaining liquid will continue to absorb as risotto sits). If there's too much liquid left in the pot, continue baking for another 5 minutes.
Place Dutch oven on the stovetop (or counter) and mix in spinach and peas until spinach is wilted. Next, add Parmesan, butter, and lemon juice and mix until well blended and saucy. Season with salt and pepper, if needed.
Serve in a large bowl or ladle into individual bowls and top with more Parmesan.