Begin by thawing your puff pastry according to package instructions, ensuring it is cold for easy handling. Preheat your oven to 400°F (200°C) and grease four 4-inch ramekins.

Roll the chilled puff pastry to about 1/8 inch thickness on a lightly floured surface. Use a round cutter to cut circles slightly larger than your ramekins, then press the pastry into each ramekin, allowing a slight overhang.

Line each pastry shell with parchment paper and fill them with baking weights or dried beans. Bake in the preheated oven for 12-15 minutes, or until golden brown. Remove the weights and bake for an additional 3-5 minutes until fully set.

In a skillet over medium heat, sauté chopped shallots and garlic in olive oil until fragrant, about 2-3 minutes. Add fresh spinach and cook until wilted. Stir in cream cheese, heavy cream, Gruyere cheese, and nutmeg, seasoning to taste.

Spoon an even portion of the creamy filling into each baked pastry shell. Crack a large egg into each shell, taking care not to break the yolk. Season each egg with salt and pepper.

Brush the edges of the puff pastry with a beaten egg wash. If desired, sprinkle Everything bagel seasoning over the top.

Return the ramekins to the oven and bake for 12-18 minutes, depending on your preference for egg doneness. For runny yolks, aim for around 12-14 minutes.

Once baked, remove the ramekins from the oven. Garnish with fresh chives and serve immediately, either in ramekins or plated.