Preheat the oven to 400F.
Line a muffin pan with paper cups. If not using paper cups, lightly grease seven of the holes of the muffin pan.
Heat the butter in a pan. Add the chopped sausage, onion and bell pepper. Cook gently over medium heat until the vegetables start to soften. Cool the mixture while you prepare the rest of the ingredients.
In a bowl, stir together the flour, baking powder, salt, baking soda, sugar and chopped herbs.
In another bowl, lightly beat the cream, mustard and egg.
Add the sausage mixture to the cream mixture. Stir to combine.
Add the sausage and cream mixture to the dry ingredients. Stir just until moistened. Do not overmix.
Bake for 20 to 25 minutes or until a toothpick inserted at the center comes out clean.
Let the savory confetti muffins cool in the pan for about five minutes before serving.