Preheat the oven to 400 degrees F / 205 degrees C. Spray a baking pan with non-stick spray. You may need two pans.
Heat a large skillet over medium heat for about 1 min. Spray the skillet with non-stick spray, making sure to coat the entire base. Add diced onions and peppers in a skillet and cook for 1-2 minutes, stirring often, until they begin to soften.
Add ground beef to the skillet and cook for 1-2 minutes, breaking it down into smaller pieces with a spatula.
Add minced garlic, Caribbean seasoning, adobo seasoning and red pepper flakes and mix. Cook for another 3-5 minutes, until ground beef is cooked through. Remove from heat to let the beef cool.
While the beef is cooling, lay out the first sheet of puff pastry. Divide it widthwise in half, then into thirds to make 6 pieces. Do the same for the other puff pastry.
Take one piece of puff pastry, add 1 Tbs. of ground beef to the center. Fold over the puff pastry and seal the edges, using your finger or a fork to pinch the edges. Place on the baking pan.
Repeat for all the puff pastry pieces.
In a small bowl, beat one egg. Using a brush, brush the egg mixture over the top of each pastry. If desired, sprinkle some sea salt over the egg wash.
Bake for 20 minutes. (Tip: Oven time can greatly vary, so you may want to check yours after 15 minutes).
Remove from the oven and cool for 5 minutes before removing from the pan and serving.