Beef and Jalapeño Empanadas

Name: Beef and Jalapeño Empanadas
Ingredients: ½ cube fresh Yeast (21 grams) (approximately 3/4 ounce); 125 milliliters lukewarm Milk; 1 pinch Sugar; 300 grams Pastry flour; 1 pinch Salt; 1 Egg yolk; 75 grams softened Butter; 1 Onion; 1 Garlic clove; 1 tablespoon Vegetable oil; 1 Red Bell pepper; 1 small Jalapeño; 400 grams Ground beef; Salt; freshly ground Pepper; 2 tablespoons Creme fraiche cheese; 1 teaspoon Tomato paste; 2 tablespoons freshly chopped Parsley; 1 tablespoon Breadcrumbs (if needed); 1 Egg