Prep the oven and baking sheet: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or aluminum foil for easy cleanup.
Prepare the peppers: Wash and dry the mini peppers. Cut each pepper in half lengthwise, leaving the stems intact for presentation if desired. Remove the seeds and membranes with a small spoon or knife. Arrange pepper halves on the prepared baking sheet.
Cook the sausage: In a skillet over medium heat, cook the Italian sausage, breaking it into small crumbles as it browns. Cook until no longer pink, about 5-7 minutes. If there's excess grease, drain it off. Allow the sausage to cool slightly.
Make the filling: In a mixing bowl, combine the softened cream cheese, shredded cheese, green onions, garlic, oregano, smoked paprika, and red pepper flakes (if using). Add the cooked sausage and mix until well combined. Season with salt and pepper to taste, keeping in mind that sausage is already seasoned.
Fill the peppers: Spoon the filling mixture into each pepper half, mounding it slightly. For a more polished presentation, you can transfer the mixture to a zippered plastic bag, snip off a corner, and pipe the filling into the peppers.
Bake to perfection: Place the stuffed peppers in the preheated oven and bake for 15-20 minutes, until the peppers are tender-crisp and the filling is heated through with golden spots on top.
Optional broil: For extra browning on top, switch to the broiler for the last 1-2 minutes, watching carefully to prevent burning.
Garnish and serve: Remove from the oven, sprinkle with fresh chopped parsley or cilantro, and allow to cool for 5 minutes before serving. These can be enjoyed warm or at room temperature.