Rinse the dried beef slices really well—they are VERY salty. Then pat dry with a paper towel. Cut into strips, then into shorter bite-sized pieces. In a large nonstick skillet over medium heat, melt the butter. Once bubbly, stir in the dried beef pieces and sauté 1-2 minutes to crisp up. Add in the garlic powder, dried oregano, and red pepper flakes. Stir in the flour until no white patches remain to create a roux. Slowly pour in the milk, a little at a time, whisking constantly.
