Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper or lightly grease it to prevent sticking.
In a large mixing bowl, combine the leftover mashed potatoes, diced bell peppers, minced garlic, shredded apple, chopped parsley, and chives. Mix thoroughly to ensure all ingredients are evenly incorporated.
Season the mixture with salt, black pepper, and paprika, enhancing the flavors of your potato patties to your liking.
Sprinkle the all-purpose flour (or gluten-free flour for a GF option) over the potato mixture and mix until the flour is fully blended. This will act as a binder, helping your patties hold their shape during baking.
Divide the potato mixture into equal portions and shape each portion into a round patty, approximately 1/2-inch thick.
Place the potato patties on the prepared baking sheet, leaving some space between each patty.
Drizzle or brush the olive oil (or your preferred cooking oil) over the potato patties, ensuring they get a golden and crispy exterior during baking.
Bake the potato patties in the preheated oven for 15-20 minutes or until they turn golden brown and crispy on the outside.
Once the patties are baked to perfection, remove them from the oven and transfer them to a serving plate.
Serve the delectable Oven-Baked Mashed Potato Patties hot, accompanied by your favorite sauce or dip to add a burst of taste to each delightful bite.