Preheat the oven to 200°C (400°F). Pour the vegetable oil into a roasting tin or large oven-safe baking tray and place it in the oven to heat while you prepare the chicken.
Crack the eggs into a shallow bowl and beat briefly; season with 1/4 teaspoon of the salt.
Place the flour in a second shallow bowl and mix in the remaining 1/4 teaspoon salt, mustard powder, and paprika.
Put the crushed pretzels and dried onion flakes in a third shallow bowl and mix to combine.
Working one piece at a time, dredge a chicken strip in the seasoned flour, shake off excess, dip into the beaten egg, then press into the pretzel mixture to coat thoroughly.
Arrange the coated chicken fingers on a lined baking tray or on the heated oiled roasting tin, leaving space between pieces.
Bake in the preheated oven for 8 minutes, use tongs to flip each piece, then bake for another 8 minutes until the chicken is cooked through and the coating is crisp and golden.
Check that the chicken is cooked through (no pink and juices run clear) and serve with your choice of dipping sauce or sides.