1. Preheat your oven to 375°F (190°C). Lightly grease a standard 12-cup muffin tin with non-stick cooking spray or melted butter. This step is crucial to ensure your nests release easily after baking.
2. In a large bowl, combine the mashed potatoes, melted butter, garlic powder, smoked paprika, salt, and pepper. Mix gently until everything is evenly incorporated. If your mashed potatoes are cold, allow them to come to room temperature for easier handling.
3. Take about 1/4 cup of the mashed potato mixture and press it firmly into the bottom and up the sides of each muffin cup, creating a shallow nest shape. This forms the crispy shell once baked.
4. In a separate bowl, mix together the shredded cheese, cooked bacon or mushrooms, green onions, and sour cream or Greek yogurt. This filling can be adjusted to your taste—feel free to add herbs like chives or parsley if you like.
5. Fill each potato nest evenly with the cheese and bacon mixture. Don’t overfill; you want the nests to hold their shape and bake evenly.
6. Top each nest with a small dollop of mashed potatoes to seal the filling, or leave them open-faced if you prefer a gooey, melty center.
7. Bake in the preheated oven for 20-25 minutes, or until the edges of the mashed potatoes are golden brown and crispy, and the filling is bubbly.
8. Allow the nests to cool in the pan for 5 minutes before gently removing them with a butter knife or small spatula. Serve warm, garnished with extra green onions or fresh herbs.

I learned from Mama Lou that patience is key here. Rushing the baking or trying to remove the nests too soon can cause them to fall apart. Let them rest briefly; it’s worth the wait.