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Preheat the oven to 325°. Lightly grease and flour a 9-by-5-trot loaf pan, tapping out any extra flour. In a tumbler measuring cup, lightly beat the eggs with the vanilla. In a medium bowl, bound the 1 1/2 cups of flour with the baking powder and salt.
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In a colossal bowl, utilizing a handheld mixer, beat the butter with the sugar at medium-excessive depart till fluffy, about 3 minutes. With the mixer at medium-low depart, step by step beat in the egg combination till fully integrated. Add the flour combination in 3 batches, beating at low depart between additions till correct integrated. Continue to beat for 30 seconds longer.
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Unfold one-third of the batter in the ready pan, then spread half of of the Nutella on prime. Repeat with any other third of the batter and the closing Nutella. High with the closing batter. Lightly swirl the Nutella into the batter with a butter knife. Accomplish not overmix.
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Bake the cake for about 1 hour and 15 minutes, till a toothpick inserted in the guts comes out shipshape. Let the cake cold in the pan for 15 minutes. Invert the cake onto a wire rack, flip it just aspect up and let cold fully, about 2 hours. Nick the cake into slices and assist.