Preheat oven to 325°F (170°C). Spray an 8½x4½-inch loaf pan with baking spray with flour. Line pan with parchment paper, letting extra prolong over sides of pan.
For filling: In a small bowl, stir collectively flour, brown sugar, and cinnamon. Utilizing your fingers, lower in butter till combination is properly mixed and sandy.
For batter: In a medium bowl, whisk collectively flour, salt, baking soda, and baking powder.
In a big bowl, whisk collectively banana, brown sugar, oil, bitter cream, eggs, melted butter, and vanilla bean paste. Steadily stir in flour combination simply till mixed. Unfold one-third of batter (about 1 cup or 280 grams) into ready pan. Sprinkle with half of filling (about 2½ packed tablespoons or 30 grams), leaving a 1⁄8- to 1⁄4-inch border round edges. Unfold one-third of batter on high of filling in pan, and sprinkle with remaining filling, leaving a 1⁄8- to 1⁄4-inch border round edges. Dollop remaining batter on high, and unfold in an excellent layer. Sprinkle with Cinnamon Sugar Topping.
Bake for 40 minutes. Rotate pan, and bake till a picket decide inserted in middle comes out clear and an instant-read thermometer inserted in middle registers 200°F (93°C) to 205°F (96°C), 26 to 32 minutes extra, loosely masking with foil throughout last 10 to 12 minutes of baking to stop extra browning. Let cool in pan on a wire rack for 10 minutes. Take away from pan, and let cool on wire rack for 10 minutes. Serve heat, or let cool utterly.
