Spice Mix: In a small pot/bowl combine 1 tsp paprika & salt, 1/4 tsp onion powder, garlic powder & black pepper and 1/8 tsp cayenne pepper. Place to one side.
Breadcrumbs: Melt 1 heaped tbsp butter into a pan over medium heat and stir in Panko breadcrumbs. Continue frying for 5 or so mins until the breadcrumbs turn golden. Remove from heat and leave to cool.
Chicken: Dice chicken breast into bite sized pieces. Spread out over a chopping board and lay over a sheet of cling film. Lightly bash each one until they're level flat. You want them fairly thin, but not so much they start breaking apart. Main thing is that they're all even sized thickness so they cook at the same rate.
Dredge: Set up 3 bowls - 1st with flour and 1 tsp of your spice mix, 2nd with beaten eggs and last with toasted breadcrumbs, parmesan and the rest of the spice mix. One by one take a piece of chicken and dredge through each bowl, finishing on an oiled wire rack above a baking tray. Really make sure you properly coat the chicken at each stage, namely breadcrumbs.
Bake: Lightly coat with oil spray then pop in the oven at 200C/390F for 15mins or until deep golden and crispy. Timings will depend on how big/thick your nuggets end up being so just be vigilant. When you slice through one it should be completely white and piping hot.
Serve: Take wire rack off tray and leave for a few mins to allow all the steam to escape. Serve up as finger food with dips or with a couple of sides as a meal (serve notes below for suggestions).