Preheat oven to 350°. Grease 9-inch loaf pan well with butter & line with parchment. Set aside.
Combine Dry Ingredients: In a mixing bowl, add flour, baking powder & salt. Whisk to combine and set aside.
Combine Wet Ingredients: In the bowl of a stand mixer w the paddle attachment, beat 10 tbs (1 stick + 2tbs) softened butter on medium 30 seconds. Add sugar and beat on medium-high until light and fluffy (about 1 minute). Make sure to scrape the sides and bottom of the bowl half way through. Next, on low, beat in one egg at a time and then vanilla. Scrape the bottom & sides of the bowl.
Add Dry to Wet: With mixer on low speed, beat in the dry ingredients in 2 increments. Finally, add 4oz of the softened cream cheese, lemon juice and zest, and mix on low or medium until combined.
Raspberry Swirl: Add a little more than ½ the batter to the loaf pan and spread evenly. Dollop 2oz of the softened cream cheese I like to melted it a little first 10-15 seconds in microwave & ½ of the raspberry jam around the top. Gently swirl it around with toothpick or tip of a knife. Add the rest of the batter on top. Spread evenly & repeat using the remaining raspberry preserves and cream cheese.
Bake: Bake the loaf cake 45-50 minutes or until a toothpick comes out clean. It should be very golden brown with a light cake fluffy center. Serve warm without glaze or allow cake to completely cool and follow glaze instructions below.
Glaze: use remaining 2 oz of cream cheese. Microwave to melt it a little in 10 second increments. In a medium bowl, whisk melted cream cheese, powdered sugar & lemon juice. Whisk until there are no clumps and it is nice and glaze-y. Pour over the completely cooled loaf cake. Let it set 3hrs or overnight to set. Slice & enjoy.