Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
In a shallow bowl, combine the chopped pecans, breadcrumbs, garlic powder, onion powder, salt, black pepper, and paprika. Mix well.
In another bowl, whisk together the egg and Dijon mustard until smooth.
Dip each chicken breast into the egg mixture, allowing any excess to drip off, then coat it in the pecan mixture, pressing gently to adhere.
Place the coated chicken breasts on the prepared baking sheet. Drizzle the olive oil over the top of the chicken.
Bake in the preheated oven for 20-25 minutes, or until the chicken is cooked through and the crust is golden brown. The internal temperature should reach 165°F.
Let the chicken rest for 5 minutes before slicing and serving.