In a medium bowl, mix Parmesan, breadcrumbs, flour, garlic powder, paprika, salt, and pepper.
Toss chicken chunks in the mixture, pressing to coat. Shake off excess and set aside.
Heat 2 tbsp butter and 2 tbsp olive oil in a skillet over medium-high. Cook chicken in a single layer for 3–4 minutes per side until golden and cooked through. Work in batches if needed. Transfer to a plate.
In the same pan, melt remaining 1 tbsp butter. Add garlic and sauté for 30–60 seconds.
Pour in broth and lemon juice, scraping up browned bits. Simmer for 1–2 minutes.
Return chicken to skillet and stir to coat in the sauce.
Garnish with parsley if desired. Serve hot and crisp.