Preheat the oven to 200 ° C (convection: 180 ° C). Grease and flour the hollows of the muffin tin or fill them with paper liners.
Wash the chives, shake dry and cut into rings with kitchen scissors. Fry the bacon in a frying pan. After frying, place the cubes of bacon on kitchen paper and allow the fat to drain off.
In a bowl, stir together the melted butter and eggs. Mix the flour, baking powder, salt and cayenne pepper in a separate bowl. Stir into the batter alternately with the milk. Fold in the chives, diced bacon and grated cheese.
Pour the batter into the muffin pan in portions and bake the hearty muffins in the preheated oven for about 15 minutes. Make a stick test, no liquid dough should stick to the wooden stick. Let the muffins cool a little.