Cheesy Greens Casserole

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1 1/2 cups heavy cream

One 8-ounce container mascarpone 

1/2 small onion, thinly sliced 

2 cloves garlic, thinly sliced 

Pinch freshly grated nutmeg 

1 teaspoon smoked paprika 

Zest of 1 lemon 

Pinch kosher salt

Pinch freshly ground black pepper 

2 bunches Tuscan kale, stemmed and torn into large pieces 

2 small or 1 large bunch regular kale, stemmed and torn into large pieces 

3 cups grated Gruyere 

1/2 cup panko breadcrumbs