Creamy Polenta with Spinach

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2 cups low-sodium chicken broth

2 tablespoons olive oil 

2 cloves garlic, smashed and peeled 

3/4 cup quick-cook polenta 

Kosher salt 

1 cup freshly grated Parmesan, plus more for serving

1/2 cup (4 ounces) mascarpone cheese 

1/2 cup freshly grated pecorino cheese 

3 tablespoons unsalted butter 

5 ounces baby spinach, roughly chopped