01 - Combine flour, sugar, yeast, and salt in stand mixer bowl.
02 - Add eggs and lukewarm milk. Mix on low with dough hook until shaggy dough forms.
03 - Increase to medium speed, knead 5 minutes. Add softened butter gradually until fully incorporated and dough is smooth and elastic, about 10 minutes.
04 - Transfer dough to greased bowl, cover, and rise in warm place until doubled, 1–1.5 hours.
05 - Line 9x5-inch loaf pan with parchment paper.
06 - Punch down dough and roll on floured surface to 10x16-inch rectangle.
07 - Spread raspberry jam evenly over dough, leaving 1/2-inch border. Sprinkle with crushed raspberries.
08 - Roll dough tightly from long side into log. Slice lengthwise down center. Twist halves together with cut sides up.
09 - Place twist in prepared pan, cover, and rise until puffed, about 45 minutes.
10 - Preheat oven to 350°F.
11 - Whisk egg and milk, brush over loaf.
12 - Bake 30–35 minutes until golden brown and sounds hollow when tapped.
13 - Cool in pan 10 minutes, transfer to wire rack to cool completely before slicing.