In mixing bowl, combine all ingredients (mix Irish Cream and Half and Half together), blending well. Pour into greased bundt pan; bake at 350 degrees for 40 - 50 minutes or until cake springs back when lightly touched.
Glaze: 1/2 c. Irish Cream mixed with 1/2 cup half and half (1 c. total); 3 cups powdered sugar. In bowl, combine glaze ingredients, blending well. While cake is still warm in pan, poke holes in it and pour glaze over it.