01 -  Preheat oven to 350°F (175°C). Grease and flour an 8-inch square baking pan. 
 02 -  In a large bowl, cream together butter and sugar until light and fluffy. Add eggs one at a time, beating well after each addition. Mix in vanilla extract, then alternate adding flour, baking powder, baking soda, and salt with the cream soda, mixing just until combined. 
 03 -  Fold in shredded cheddar cheese and crushed pretzels until evenly distributed. 
 04 -  Pour batter into prepared pan and bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean. Let cool completely. 
 05 -  Beat softened butter until creamy, gradually add powdered sugar, cream soda, and vanilla extract, mixing until smooth and uniform. 
 06 -  Crumble cooled cake into a large bowl. Add 1 cup of frosting and mix until the mixture holds together when pressed. Add more frosting if needed for binding. 
 07 -  Scoop and roll mixture into 1.5-inch balls. Arrange on a parchment-lined baking sheet and freeze for 20 minutes to firm. 
 08 -  Melt chocolate and assorted candy melts separately in bowls using a microwave or double boiler. 
 09 -  Dip each chilled cake ball into melted chocolate or colored candy melts, allowing excess to drip off. Place on parchment paper. 
 10 -  While coating is still wet, affix candy eyes and sprinkle extra crushed pretzels for decoration. 
 11 -  Chill decorated balls until chocolate is set. Serve at room temperature.