Melt butter in a small saucepan over low heat. Remove from heat and cool for 7-10 minutes.
Add 1 cup vanilla chips to cooled butter. Do not stir. Let chips soften in butter.
Beat eggs with electric mixer until frothy. Add sugar and almond extract, beat until combined.
Pour vanilla chip mixture into egg mixture. In separate bowl, whisk flour and salt, then add to wet ingredients. Stir gently until just combined.
Spread half the batter into greased 9x9 inch pan. Bake at 325°F for 15-20 minutes until set and lightly golden.
Warm raspberry preserves in small saucepan over low heat until spreadable. Spread over baked crust, leaving 1/8 inch border.
Stir remaining vanilla chips into remaining batter. Drop by teaspoonfuls over preserve layer. Sprinkle with sliced almonds.
Bake 30-35 minutes more until toothpick inserted near center comes out clean. Cool completely before cutting into bars.