Place eggs in a saucepan and cover with cold water. Bring water to boil and immediately turn off the heat. Let them stand in the water for 12 minutes. Drain water and immediately run cold water over eggs until cooled. 

While waiting until the eggs are cooked, toast bread on a pan or in a toaster until crisp. While the bread is still hot, spread butter on one side of the bread (optional).

Peel the eggs and roughly chop them. In a medium bowl, mix chopped eggs, mayo, chives, dried parsley, and paprika powder until well incorporated. Season with salt, pepper, and crushed chili pepper flakes.

Spread the egg mixture onto 2 slices of bread and cover with another slices (The butter side on inside).