Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.

Hollow out each bagel using a knife or spoon, leaving enough bagel around the edges.

In a mixing bowl, whisk eggs, heavy cream, and cheese until creamy; add in vegetables or meats and season with salt and pepper.

Fill each hollowed bagel with the prepared quiche mixture, leaving space at the top.

Sprinkle additional cheese on top of each stuffed bagel.

Bake for 15 to 18 minutes until tops are golden and filling is set.

Let the bagels cool for a few minutes, then garnish with chives or paprika if desired.