Mother's Lemon Chicken

Ingredients

• 1 pound chicken breasts, boneless and skinless, cut into 1-inch strips
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1/2 cup all-purpose flour
• 1/4 teaspoon garlic powder
• 1/4 teaspoon paprika
• 1 large egg
• 3 tablespoons lemon juice, divided
• 1/4 cup butter, cubed
• 1 cup chicken broth
• 1/2 teaspoon lemon zest, grated
• 4 cups fresh broccoli florets
• rice, optional, to taste, cooked and hot, for serving
• lemon slices, to taste