Bacon and Spinach Crustless Quiche

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2 tablespoons unsalted butter, at room temperature

2 tablespoons finely grated Parmesan

2 cups half-and-half

1 tablespoon all-purpose flour

Pinch cayenne

2 large eggs plus 2 large egg yolks

Kosher salt and freshly ground black pepper

2 cups packed baby spinach, plus more for serving (optional)

3/4 cup chopped cooked bacon

1/2 cup grated mozzarella

2 tablespoons chopped fresh chives