Begin by placing 6 large eggs in a pot and covering them with cold water, ensuring the water is about an inch above the eggs. Bring the water to a rolling boil over medium-high heat, then cover the pot and reduce heat to low, allowing them to cook for 20 minutes for perfect hard-boiled eggs.

Once the eggs are perfectly cooked, transfer them to a bowl filled with ice water using a slotted spoon. Let them cool for about 5-10 minutes to halt the cooking process and make peeling easier.

Carefully peel the cooled eggs, rinsing them under cool water to remove any stubborn bits of shell. Slice each egg in half lengthwise and gently press the cut side on a stable surface to trim the bottom for stability.

In a mixing bowl, push the yolks through a fine mesh strainer. Add mayo, sour cream, spicy brown mustard, salt, and pepper. Mix until creamy and well-combined, then chill in the refrigerator for about 15 minutes.

While the filling chills, take a large red bell pepper and slice it in half. Remove the seeds and membranes, then cut out wings and horns in fun shapes.

Scoop the chilled yolk mixture into a piping bag or use a spoon to fill each egg white generously. Top each egg with the bell pepper decorations to create wingtips and horns.

For the best presentation, assemble your Adorable Halloween Deviled Eggs just before serving to prevent the filling from drying out.