Preheat the oven to 400F (200C).
In a large bowl, add the ground meat, egg, salt, oregano, garlic powder, black pepper, and cheese. Don't forget to measure with your heart, adding more or less of each ingredient, as desired.
Use your hands to mix everything really well (don't be afraid to get messy).
Take each piece of baguette and lay it flat onto a baking sheet lined with parchment paper. Spread on a thin layer of butter and scoop 4 to 5 heaping tablespoons of the meat filling onto each slice. You can distribute it evenly, pressing down with the back of a fork or even use your hands.
Make sure that each piece has an even layer of meat on it so that it cooks evenly.
Bake at 400°F (200°C) for 20 minutes or until the meat is thoroughly cooked. I recommend using the broiler for the last 1 to 2 minutes to achieve a golden-brown top, but be sure to keep a close eye on it.
Enjoy the dish with hot pepper oil on top, a green salad on the side, or Bulgarian-style with refreshing plain yogurt or kefir.