Frangipane can be made immediately before the batter or prepared a day in advance.
In a medium bowl, stir butter until creamy. Add almond flour, sugar, all-purpose flour, egg white, salt, and almond extract. Stir until combined. Cover with plastic wrap pressed to the top, and place in fridge until ready to use.
Loaf
Preheat oven at 375 degrees. Cut parchment paper to fit inside an 8x4 loaf pan like a sling extended up both long sides. Spray inside of pan with nonstick spray, then spray parchment.
Use kitchen shears to break frozen raspberries into pieces of various size, measuring out 1 1/4 cup total. Stash raspberries back in freezer until ready to use.
In a large bowl, beat together butter and sugar until fluffy. Add eggs one at a time followed by the extracts.
In another bowl, sift together the 1 3/4 cups flour, baking powder, and salt. Gradually mix dry ingredients into the wet, mixing alternatively with the yogurt. Scrape the bottom of the bowl to make sure everything is combined.
Fold the frangipane into the batter.
Pull out the raspberries. Toss them with the remaining tablespoon of flour. Set aside 1/4 of coated berries for the top; fold the rest of the berries into the batter.
Spread batter in prepared pan, evening out the top. Sprinkle reserved raspberries on top, followed by the sliced almonds.
Bake for 20 minutes. Reduce oven temperature to 325 degrees. Continue to bake until the top is golden and the inside registers an interior temperature over 200 degrees, which will be about another 40 minutes. (Total baking time will be between 55 minutes and 1 hour 5 minutes.) If the loaf is looking brown early on, cover with a small piece of foil.
Let cool in pan about 20 minutes, then use the parchment sling to lift the loaf onto a rack to completely cool.
Glaze
Once the loaf is completely cool, mix the glaze. It should be fairly thick; add a touch more confectioners’ sugar if needed. Drizzle over loaf so that the top is covered with glaze dripping down the sides.
Give the glaze at least 30 minutes to set before cutting into the loaf, or wrap loaf to serve later or the next day. Loaf will keep well, wrapped at room temperature, for up to 4 days.