Prepare the Beef Filling: Heat 1 tablespoon of oil in a 12-inch nonstick skillet over medium-high heat until just smoking. Add the ground beef, then season with bouillon (or salt to taste), black pepper, red pepper flakes, paprika, and cumin. Cook until browned on all sides.
Add the onions, bell peppers, tomatoes, and the white parts of the scallions. Sauté, stirring occasionally, until softened, about 5–7 minutes. Add the garlic and cook for 30 seconds.
Continue cooking for a few more minutes to eliminate excess moisture. Stir in the parsley and the green parts of the scallions. Remove from heat and let cool slightly.
Transfer the mixture to a large bowl, and let it cool to room temperature. Cover and refrigerate until ready to assemble.
Prepare the Dough: In a large mixing bowl, whisk together the cornmeal and salt. Add the butter, cheese, and milk. Mix until a homogeneous dough forms—not too dry, not too wet, but just enough to bring everything together. If needed, add more milk, one tablespoon at a time. Cover the bowl and refrigerate until ready to use..
Assembly & Baking: Take a portion of the dough and roll it into a ball. Gently flatten it in your hand, then use your thumb to press an indentation in the center, like forming a small basket.
Spoon a heaping tablespoon of the meat filling into the center. Carefully bring the edges of the dough up and around the filling, sealing it completely. Shape it back into a smooth ball.
Flatten the base slightly and round the top to form a dome. Place each assembled chipa so’o on a nonstick baking sheet or a greased baking tray. Repeat with the remaining dough and filling. You may need to bake in two batches, depending on the size of your tray.
Bake in a preheated oven at 260°C (500°F) for 25–30 minutes or until golden and lightly cracked on top.