Homemade Beef Empanadas

Name: Homemade Beef Empanadas
Ingredients: 3 cups all-purpose flour; 1 and 1/2 stick unsalted butter ((6 ounces of butter)); 1 large egg; 1/4-1/2 cup milk; 1 pound Laura's Lean Ground Beef; 1 Tbsp. unsalted butter; 1 Tbsp. Avocado oil (or other oil); 2 Yellow onions, sliced into thin circles; 1 Tbsp. Smoked Paprika; 6-8 Castelvetrano Olives (or other favorite green olive); 2 hard boiled eggs, cut into rounds; 1 1/2 tsp. kosher salt (or more to taste); 1 tsp. black pepper; 1 tsp. ground cumin