Melt together in microwave peanut butter and 2 sticks butter. Add powdered sugar and mix well. Refrigerate at least 30 minutes.
In a medium bowl, melt the chocolate almond bark.
Use a basting brush to brush the chocolate all over the inside of pumpkin molds. Chill about 10 minutes.
Brush another layer of chocolate into the pumpkin molds. Chill 10 minutes until chocolate is firm.
Press peanut butter filling into the middle of the pumpkin molds. Leave about 1/8-inch of space at the top of the mold for the chocolate layer.
Spoon melted chocolate to completely cover the peanut butter filling. Use a straight edge or the flat edge of a spatula to level off the chocolate. Ensure that peanut butter filling is completely covered.
Place in refrigerator 15 minutes until set.
When the chocolate has hardened, gently break away the excess chocolate around the edges of the mold then peel back the silicone mold to remove the chocolate-covered pumpkin.