Make a hard-boiled egg by placing the egg with its shell in a pot and fill it with water until the egg is covered. Bring the pot of water to a boil on the stove, then continue boiling the egg for 10 minutes. Once done, transfer the egg to an ice bath to chill until it’s cool enough to touch. Crack the eggshell by rolling it on a flat surface, then peel the shell away. You may wish to make an extra hard-boiled egg in case the first one becomes damaged.
Slice the egg in half and scoop the hard yolk into a mixing bowl. Use a fork to mash the egg yolk, then stir in brown mustard, salt, pepper, paprika, garlic powder, parsley, and chopped chives. If it seems like the spices are too strong, you can include just a pinch of each spice instead of the whole listed amount. Gently spoon the prepared deviled egg filling back into the cooked egg yolks.
Set the finished deviled eggs on a serving plate. Turn on the oven to preheat to 375 degrees and line a sheet tray with parchment paper. Spread 1-tablespoon portions of shredded parmesan cheese into small circles on the tray. Make the cheese chips by baking the parmesan circles in your oven for 7-10 minutes. Watch the cheese as it melts, bubbles, and hardens into crispy, crunchy chips.
Arrange the parmesan cheese chips next to your deviled eggs. Make your dijon aioli by quickly whisking together mayonnaise, dijon, olive oil, and onion powder. Like the deviled egg filling, if you think too much spice is being added to the aioli, you can include just a pinch instead. If you want a looser aioli, you can add more olive oil. Drizzle the aioli across your deviled eggs for serving.