Season the beef with garlic, salt, and pepper, then set aside.
Melt the butter in a skillet over high heat and brown/cook the beef. Remove and set aside.
In the same skillet, add the onion, bell pepper, thyme, and stir. Cook until the vegetables are soft, season with salt to allow the onion to leach out quickly.
Chop the cooked beef and transfer to the pan and combine. Check the seasoning and readjust if necessary. Allow to cool down.
Dust a countertop with flour, open the biscuit and roll out each biscuit one at a time, then brush with egg wash.
Top with half of the sliced cheese, then add the beef mixture then cover with the half of the remaining cheese. Make sure you don’t overfill the biscuit, gently cover the biscuits if necessary, brush with more egg wash to secure the biscuit.
Place in the prepared pan and continue with the rest. Brush the top with egg wash and bake in the preheated oven according to the biscuit package time or until golden brown. Mine took about 15 minutes.