Preparing these Spinach and Feta Stuffed Mushrooms is a straightforward process. Follow these step-by-step instructions to achieve the perfect blend of flavors and textures:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C). This ensures that your mushrooms cook evenly and come out perfectly baked.
2. Prepare the Mushrooms: Remove the stems from the mushrooms and chop them finely. This not only allows the stuffing to fit perfectly within the caps but also ensures that no part of the mushroom goes to waste.
3. Sauté Garlic and Stems: In a skillet, heat the olive oil over medium heat. Add minced garlic and the chopped mushroom stems. Sauté for 2-3 minutes until the mixture is soft and aromatic.
4. Wilt the Spinach: Add the chopped spinach to the skillet. Cook until the spinach is wilted. This should only take a minute or two. Once done, remove the skillet from heat.
5. Prepare the Filling: In a mixing bowl, combine the spinach mixture with crumbled feta cheese, softened cream cheese, black pepper, and salt. Mix until all the ingredients are well incorporated and the filling is smooth.
6. Stuff the Mushrooms: Fill each mushroom cap with a generous amount of the spinach and feta mixture. If you prefer, you can top the stuffed mushrooms with breadcrumbs for an added crunchy texture.
7. Bake: Place the stuffed mushrooms on a baking sheet. Bake them in the preheated oven for about 20 minutes, or until they are golden brown and the filling is heated through.