In a large bowl, toss the diced tofu with the cornstarch and 1 teaspoon of the Cajun seasoning until evenly coated.
Heat 2 tablespoons of oil in a large sauté pan over medium-high heat.
Once the oil is hot, add the tofu and cook, stirring occasionally, until golden and crispy on all sides, 12 to 15 minutes.
Remove from the pan and set aside.
Heat the remaining tablespoon of oil in the same pan over medium heat.
Add the onion and bell pepper. Cover and cook, stirring every few minutes, until caramelized, 10 to 15 minutes.
Meanwhile, preheat your oven to 375°F.
Add the reserved tofu back to the pan and toss to combine.
Next, add the garlic and season with the remaining ½ teaspoon of the Cajun seasoning. Cook until fragrant, 1 to 2 minutes.
Reduce the heat to low. Stir in the mozzarella and cheddar until melted and creamy throughout, 3 to 5 minutes. Remove from heat.
On a lightly floured surface, roll out each puff pastry sheet slightly to smooth. Cut each into 9 squares (18 total).
Place 2 tablespoons of the filling in the center of half of the pastry squares, leaving room at the edges.
Top each pastry square with another square and seal the edges with a fork. Transfer to a parchment-lined baking sheet.
Bake at 375°F for 20 minutes.
Remove from the oven, brush the tops of the hand pies with the melted butter.
Sprinkle the tops with a little extra cheddar (if using) and bake another 6 to 10 minutes, until golden brown and crispy.
Let cool at room temperature before serving.
Garnish with fresh minced parsley and serve with your favorite hot sauce. ENJOY!