In a large bowl, beat shortening, and peanut butter until combined.
Add sugars; beat till fluffy. Beat in egg, milk, and vanilla.
Beat in flour and baking soda. Stir in peanuts.
Drop on ungreased cookie sheet. Flatten slightly with the bottom of a glass dipped in sugar.
Bake at 375 degrees for 8 to 10 minutes or till set.
Cool cookies on wire rack.
To make the praline frosting: In a small saucepan, combine brown sugar and cream, heat and stir until bubbly. Reduce heat and simmer for 2 minutes. Remove from heat. Beat in powdered sugar till smooth. Immediately drizzle over cookies.